diff --git a/src/components/popover/popover.component.html b/src/components/popover/popover.component.html
index b8fdc819..5c299214 100644
--- a/src/components/popover/popover.component.html
+++ b/src/components/popover/popover.component.html
@@ -47,16 +47,36 @@
         </ul>
     </div>
     <div [ngSwitch]="activeTab">
-        <keypress-tab #tab *ngSwitchCase="tabName.Keypress" class="popover-content" [defaultKeyAction]="defaultKeyAction" [longPressEnabled]="true"></keypress-tab>
-        <layer-tab #tab *ngSwitchCase="tabName.Layer" class="popover-content" [defaultKeyAction]="defaultKeyAction" [currentLayer]="currentLayer"></layer-tab>
-        <mouse-tab #tab *ngSwitchCase="tabName.Mouse" class="popover-content" [defaultKeyAction]="defaultKeyAction"></mouse-tab>
-        <macro-tab #tab *ngSwitchCase="tabName.Macro" class="popover-content" [defaultKeyAction]="defaultKeyAction"></macro-tab>
-        <keymap-tab #tab *ngSwitchCase="tabName.Keymap" class="popover-content" [defaultKeyAction]="defaultKeyAction" [keymaps]="keymaps$ | async"></keymap-tab>
-        <none-tab #tab *ngSwitchCase="tabName.None" class="popover-content"></none-tab>
+        <keypress-tab #tab *ngSwitchCase="tabName.Keypress" class="popover-content"
+                      [defaultKeyAction]="defaultKeyAction"
+                      [longPressEnabled]="true"
+                      (validAction)="keyActionValid=$event"
+        ></keypress-tab>
+        <layer-tab #tab *ngSwitchCase="tabName.Layer" class="popover-content"
+                   [defaultKeyAction]="defaultKeyAction"
+                   [currentLayer]="currentLayer"
+                   (validAction)="keyActionValid=$event"
+        ></layer-tab>
+        <mouse-tab #tab *ngSwitchCase="tabName.Mouse" class="popover-content"
+                   [defaultKeyAction]="defaultKeyAction"
+                   (validAction)="keyActionValid=$event"
+        ></mouse-tab>
+        <macro-tab #tab *ngSwitchCase="tabName.Macro" class="popover-content"
+                   [defaultKeyAction]="defaultKeyAction"
+                   (validAction)="keyActionValid=$event"
+        ></macro-tab>
+        <keymap-tab #tab *ngSwitchCase="tabName.Keymap" class="popover-content"
+                    [defaultKeyAction]="defaultKeyAction"
+                    [keymaps]="keymaps$ | async"
+                    (validAction)="keyActionValid=$event"
+        ></keymap-tab>
+        <none-tab #tab *ngSwitchCase="tabName.None" class="popover-content"
+                  (validAction)="keyActionValid=$event"
+        ></none-tab>
     </div>
     <div class="popover-action">
         <button class="btn btn-sm btn-default" type="button" (click)="onCancelClick()"> Cancel </button>
-        <button class="btn btn-sm btn-primary" type="button" (click)="onRemapKey()"> Remap Key </button>
+        <button class="btn btn-sm btn-primary" [class.disabled]="!keyActionValid" type="button" (click)="onRemapKey()"> Remap Key </button>
     </div>
 </div>
 <div class="popover-overlay" [class.display]="visible" (click)="onOverlay()"></div>
diff --git a/src/components/popover/popover.component.ts b/src/components/popover/popover.component.ts
index 457ed925..5b334460 100644
--- a/src/components/popover/popover.component.ts
+++ b/src/components/popover/popover.component.ts
@@ -79,6 +79,7 @@ export class PopoverComponent implements OnChanges {
     @ViewChild('popover') popoverHost: ElementRef;
 
     public tabName = TabName;
+    public keyActionValid: boolean;
     private activeTab: TabName;
     private keymaps$: Observable<Keymap[]>;
     private leftArrow: boolean = false;
@@ -134,16 +135,19 @@ export class PopoverComponent implements OnChanges {
     }
 
     onRemapKey(): void {
-        try {
-            let keyAction = this.selectedTab.toKeyAction();
-            this.remap.emit(keyAction);
-        } catch (e) {
-            // TODO: show error dialog
-            console.error(e);
+        if (this.keyActionValid) {
+            try {
+                let keyAction = this.selectedTab.toKeyAction();
+                this.remap.emit(keyAction);
+            } catch (e) {
+                // TODO: show error dialog
+                console.error(e);
+            }
         }
     }
 
-    @HostListener('keydown.escape') onEscape(): void {
+    @HostListener('keydown.escape')
+    onEscape(): void {
         this.cancel.emit();
     }
 
diff --git a/src/components/popover/tab/keymap/keymap-tab.component.ts b/src/components/popover/tab/keymap/keymap-tab.component.ts
index 76800771..327a45a9 100644
--- a/src/components/popover/tab/keymap/keymap-tab.component.ts
+++ b/src/components/popover/tab/keymap/keymap-tab.component.ts
@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, Input, OnChanges, OnInit } from '@angular/core';
+import { ChangeDetectionStrategy, Component, EventEmitter, Input, OnChanges, OnInit, Output } from '@angular/core';
 
 import { Select2OptionData } from 'ng2-select2/ng2-select2';
 
@@ -12,7 +12,7 @@ import { Tab } from '../tab';
     styles: [require('./keymap-tab.component.scss')],
     changeDetection: ChangeDetectionStrategy.OnPush
 })
-export class KeymapTabComponent implements OnInit, OnChanges, Tab {
+export class KeymapTabComponent extends Tab implements OnInit, OnChanges {
     @Input() defaultKeyAction: KeyAction;
     @Input() keymaps: Keymap[];
 
@@ -20,6 +20,7 @@ export class KeymapTabComponent implements OnInit, OnChanges, Tab {
     private selectedKeymap: Keymap;
 
     constructor() {
+        super();
         this.keymapOptions = [];
     }
 
@@ -38,6 +39,7 @@ export class KeymapTabComponent implements OnInit, OnChanges, Tab {
 
     ngOnChanges() {
         this.fromKeyAction(this.defaultKeyAction);
+        this.validAction.emit(true);
     }
 
     // TODO: change to the correct type when the wrapper has added it.
diff --git a/src/components/popover/tab/keypress/keypress-tab.component.ts b/src/components/popover/tab/keypress/keypress-tab.component.ts
index e453f62c..013a4135 100644
--- a/src/components/popover/tab/keypress/keypress-tab.component.ts
+++ b/src/components/popover/tab/keypress/keypress-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component, Input, OnChanges } from '@angular/core';
+import { Component, Input, EventEmitter, OnChanges, Output } from '@angular/core';
 
 import { Select2OptionData, Select2TemplateFunction } from 'ng2-select2';
 
@@ -12,7 +12,7 @@ import { MapperService } from '../../../../services/mapper.service';
     template: require('./keypress-tab.component.html'),
     styles: [require('./keypress-tab.component.scss')]
 })
-export class KeypressTabComponent implements OnChanges, Tab {
+export class KeypressTabComponent extends Tab implements OnChanges {
     @Input() defaultKeyAction: KeyAction;
     @Input() longPressEnabled: boolean;
 
@@ -30,6 +30,7 @@ export class KeypressTabComponent implements OnChanges, Tab {
     private selectedLongPressIndex: number;
 
     constructor(private mapper: MapperService) {
+        super();
         this.leftModifiers = ['LShift', 'LCtrl', 'LSuper', 'LAlt'];
         this.rightModifiers = ['RShift', 'RCtrl', 'RSuper', 'RAlt'];
         this.scanCodeGroups = [{
@@ -58,13 +59,15 @@ export class KeypressTabComponent implements OnChanges, Tab {
 
     ngOnChanges() {
         this.fromKeyAction(this.defaultKeyAction);
+        this.validAction.emit(this.keyActionValid());
     }
 
     keyActionValid(keystrokeAction?: KeystrokeAction): boolean {
         if (!keystrokeAction) {
             keystrokeAction = this.toKeyAction();
         }
-        return keystrokeAction.scancode > 0 || keystrokeAction.modifierMask > 0;
+
+        return (keystrokeAction) ? (keystrokeAction.scancode > 0 || keystrokeAction.modifierMask > 0) : false;
     }
 
     onKeysCapture(event: {code: number, left: boolean[], right: boolean[]}) {
@@ -76,6 +79,7 @@ export class KeypressTabComponent implements OnChanges, Tab {
 
         this.leftModifierSelects = event.left;
         this.rightModifierSelects = event.right;
+        this.validAction.emit(this.keyActionValid());
     }
 
     fromKeyAction(keyAction: KeyAction): boolean {
@@ -120,11 +124,9 @@ export class KeypressTabComponent implements OnChanges, Tab {
             ? undefined
             : this.mapper.modifierMapper(this.selectedLongPressIndex);
 
-        if (!this.keyActionValid(keystrokeAction)) {
-            throw new Error('KeyAction is invalid!');
+        if (this.keyActionValid(keystrokeAction)) {
+            return keystrokeAction;
         }
-
-        return keystrokeAction;
     }
 
     scanCodeTemplateResult: Select2TemplateFunction = (state: Select2OptionData): JQuery | string => {
@@ -149,6 +151,8 @@ export class KeypressTabComponent implements OnChanges, Tab {
     toggleModifier(right: boolean, index: number) {
         let modifierSelects: boolean[] = right ? this.rightModifierSelects : this.leftModifierSelects;
         modifierSelects[index] = !modifierSelects[index];
+
+        this.validAction.emit(this.keyActionValid());
     }
 
     onLongpressChange(event: {value: string}) {
@@ -157,5 +161,6 @@ export class KeypressTabComponent implements OnChanges, Tab {
 
     onScancodeChange(event: {value: string}) {
         this.scanCode = +event.value;
+        this.validAction.emit(this.keyActionValid());
     }
 }
diff --git a/src/components/popover/tab/layer/layer-tab.component.ts b/src/components/popover/tab/layer/layer-tab.component.ts
index 08447089..38d18963 100644
--- a/src/components/popover/tab/layer/layer-tab.component.ts
+++ b/src/components/popover/tab/layer/layer-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component, HostBinding, Input, OnChanges, SimpleChanges } from '@angular/core';
+import { Component, EventEmitter, HostBinding, Input, OnChanges, Output, SimpleChanges } from '@angular/core';
 
 import { KeyAction, LayerName, SwitchLayerAction } from '../../../../config-serializer/config-items/key-action';
 
@@ -9,7 +9,7 @@ import { Tab } from '../tab';
     template: require('./layer-tab.component.html'),
     styles: [require('./layer-tab.component.scss')]
 })
-export class LayerTabComponent implements OnChanges, Tab {
+export class LayerTabComponent extends Tab implements OnChanges {
     @Input() defaultKeyAction: KeyAction;
     @Input() currentLayer: number;
 
@@ -45,6 +45,7 @@ export class LayerTabComponent implements OnChanges, Tab {
     private layer: LayerName;
 
     constructor() {
+        super();
         this.toggle = false;
         this.layer = LayerName.mod;
     }
@@ -57,6 +58,8 @@ export class LayerTabComponent implements OnChanges, Tab {
         if (changes['currentLayer']) {
             this.isNotBase = this.currentLayer > 0;
         }
+
+        this.validAction.emit(true);
     }
 
     keyActionValid(): boolean {
diff --git a/src/components/popover/tab/macro/macro-tab.component.ts b/src/components/popover/tab/macro/macro-tab.component.ts
index ba657722..130b77f0 100644
--- a/src/components/popover/tab/macro/macro-tab.component.ts
+++ b/src/components/popover/tab/macro/macro-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component, Input, OnChanges, OnDestroy, OnInit } from '@angular/core';
+import { Component, EventEmitter, Input, OnChanges, OnDestroy, OnInit, Output } from '@angular/core';
 
 import { Store } from '@ngrx/store';
 
@@ -19,7 +19,7 @@ import { getMacroEntities } from '../../../../store/reducers/macro';
     template: require('./macro-tab.component.html'),
     styles: [require('./macro-tab.component.scss')]
 })
-export class MacroTabComponent implements OnInit, OnChanges, OnDestroy, Tab {
+export class MacroTabComponent extends Tab implements OnInit, OnChanges, OnDestroy {
     @Input() defaultKeyAction: KeyAction;
 
     private macros: Macro[];
@@ -28,6 +28,7 @@ export class MacroTabComponent implements OnInit, OnChanges, OnDestroy, Tab {
     private subscription: Subscription;
 
     constructor(private store: Store<AppState>) {
+        super();
         this.subscription = store.let(getMacroEntities())
             .subscribe((macros: Macro[]) => this.macros = macros);
         this.macroOptions = [];
@@ -45,6 +46,7 @@ export class MacroTabComponent implements OnInit, OnChanges, OnDestroy, Tab {
 
     ngOnChanges() {
         this.fromKeyAction(this.defaultKeyAction);
+        this.validAction.emit(true);
     }
 
     // TODO: change to the correct type when the wrapper has added it.
diff --git a/src/components/popover/tab/mouse/mouse-tab.component.html b/src/components/popover/tab/mouse/mouse-tab.component.html
index 8b509deb..b37c704c 100644
--- a/src/components/popover/tab/mouse/mouse-tab.component.html
+++ b/src/components/popover/tab/mouse/mouse-tab.component.html
@@ -86,20 +86,20 @@
             <p>Press this key along with mouse movement/scrolling to accelerate/decelerate the speed of the action.</p>
         </div>
         <div class="btn-group btn-group-lg" role="group">
-            <div class="btn btn-default"
+            <button class="btn btn-default"
                 [class.btn-primary]="mouseActionParam === MouseActionParam.decelerate"
                 (click)="setMouseActionParam(MouseActionParam.decelerate)"
             >
                 -
                 <span>Decelerate</span>
-            </div>
-            <div class="btn btn-default"
+            </button>
+            <button class="btn btn-default"
                 [class.btn-primary]="mouseActionParam === MouseActionParam.accelerate"
                 (click)="setMouseActionParam(MouseActionParam.accelerate)"
             >
                 +
                 <span>Accelerate</span>
-            </div>
+            </button>
         </div>
         <div class="help-text--mouse-speed last-help  text-left">
             <p>You can set the multiplier in the <a [routerLink]="['/settings']" title="Settings">settings</a>.</p>
diff --git a/src/components/popover/tab/mouse/mouse-tab.component.ts b/src/components/popover/tab/mouse/mouse-tab.component.ts
index 8c57b796..05db35a2 100644
--- a/src/components/popover/tab/mouse/mouse-tab.component.ts
+++ b/src/components/popover/tab/mouse/mouse-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component, Input, OnChanges } from '@angular/core';
+import { Component, EventEmitter, Input, OnChanges, Output } from '@angular/core';
 
 import { KeyAction, MouseAction, MouseActionParam } from '../../../../config-serializer/config-items/key-action';
 import { Tab } from '../tab';
@@ -8,7 +8,7 @@ import { Tab } from '../tab';
     template: require('./mouse-tab.component.html'),
     styles: [require('./mouse-tab.component.scss')]
 })
-export class MouseTabComponent implements OnChanges, Tab {
+export class MouseTabComponent extends Tab implements OnChanges {
     @Input() defaultKeyAction: KeyAction;
 
     private mouseActionParam: MouseActionParam;
@@ -21,12 +21,14 @@ export class MouseTabComponent implements OnChanges, Tab {
     private pages: string[];
 
     constructor() {
+        super();
         this.selectedPageIndex = 0;
         this.pages = ['Move', 'Scroll', 'Click', 'Speed'];
     }
 
     ngOnChanges() {
         this.fromKeyAction(this.defaultKeyAction);
+        this.validAction.emit(this.keyActionValid());
     }
 
     keyActionValid(): boolean {
@@ -37,12 +39,14 @@ export class MouseTabComponent implements OnChanges, Tab {
         if (!(keyAction instanceof MouseAction)) {
             return false;
         }
+
         let mouseAction: MouseAction = <MouseAction>keyAction;
         this.mouseActionParam = mouseAction.mouseAction;
 
         if (mouseAction.mouseAction === MouseActionParam.moveUp) {
             this.selectedPageIndex = 0;
         }
+
         switch (mouseAction.mouseAction) {
             case MouseActionParam.moveDown:
             case MouseActionParam.moveUp:
@@ -68,13 +72,11 @@ export class MouseTabComponent implements OnChanges, Tab {
             default:
                 return false;
         }
+
         return true;
     }
 
     toKeyAction(): MouseAction {
-        if (!this.keyActionValid()) {
-            throw new Error('KeyAction is not valid. No selected mouse action!');
-        }
         let mouseAction: MouseAction = new MouseAction();
         mouseAction.mouseAction = this.mouseActionParam;
         return mouseAction;
@@ -85,12 +87,14 @@ export class MouseTabComponent implements OnChanges, Tab {
             console.error(`Invalid index error: ${index}`);
             return;
         }
+
         this.selectedPageIndex = index;
         this.mouseActionParam = undefined;
+        this.validAction.emit(false);
     }
 
     setMouseActionParam(mouseActionParam: MouseActionParam) {
         this.mouseActionParam = mouseActionParam;
+        this.validAction.emit(true);
     }
-
 }
diff --git a/src/components/popover/tab/none/none-tab.component.ts b/src/components/popover/tab/none/none-tab.component.ts
index e6270727..55105afb 100644
--- a/src/components/popover/tab/none/none-tab.component.ts
+++ b/src/components/popover/tab/none/none-tab.component.ts
@@ -1,4 +1,4 @@
-import { Component } from '@angular/core';
+import { Component, EventEmitter, OnChanges, Output } from '@angular/core';
 
 import { Tab } from '../tab';
 
@@ -7,7 +7,11 @@ import { Tab } from '../tab';
     template: require('./none-tab.component.html'),
     styles: [require('./none-tab.component.scss')]
 })
-export class NoneTabComponent implements Tab {
+export class NoneTabComponent extends Tab implements OnChanges {
+    ngOnChanges(event: any) {
+        this.validAction.emit(true);
+    }
+
     keyActionValid(): boolean {
         return true;
     }
diff --git a/src/components/popover/tab/tab.ts b/src/components/popover/tab/tab.ts
index c73470d2..9e75d544 100644
--- a/src/components/popover/tab/tab.ts
+++ b/src/components/popover/tab/tab.ts
@@ -1,7 +1,11 @@
+import { EventEmitter, Output } from '@angular/core';
+
 import { KeyAction } from '../../../config-serializer/config-items/key-action';
 
-export interface Tab {
-    keyActionValid(): boolean;
-    fromKeyAction(keyAction: KeyAction): boolean;
-    toKeyAction(): KeyAction;
+export abstract class Tab {
+    @Output() validAction = new EventEmitter<boolean>();
+
+    abstract keyActionValid(): boolean;
+    abstract fromKeyAction(keyAction: KeyAction): boolean;
+    abstract toKeyAction(): KeyAction;
 }