diff --git a/src/vs/base/browser/contextmenu.ts b/src/vs/base/browser/contextmenu.ts
index 54dc4d766cab34413c04710a757639aa862cb9e8..4e0bb4b263b89cdb66c4057d2c7d8db6d95d017a 100644
--- a/src/vs/base/browser/contextmenu.ts
+++ b/src/vs/base/browser/contextmenu.ts
@@ -25,6 +25,7 @@ export class ContextSubMenu extends SubmenuAction {
 export interface IContextMenuDelegate {
 	getAnchor(): HTMLElement | { x: number; y: number; width?: number; height?: number; };
 	getActions(): ReadonlyArray<IAction | ContextSubMenu>;
+	getCheckedActionsRepresentation?(action: IAction): 'radio' | 'checkbox';
 	getActionViewItem?(action: IAction): IActionViewItem | undefined;
 	getActionsContext?(event?: IContextMenuEvent): any;
 	getKeyBinding?(action: IAction): ResolvedKeybinding | undefined;
diff --git a/src/vs/base/browser/ui/actionbar/actionbar.ts b/src/vs/base/browser/ui/actionbar/actionbar.ts
index 27925b09b9c176b1f59db27472d040091d15bb45..c8dc421e6d47ebc8c0f62a6d5a12648e76097e57 100644
--- a/src/vs/base/browser/ui/actionbar/actionbar.ts
+++ b/src/vs/base/browser/ui/actionbar/actionbar.ts
@@ -224,7 +224,6 @@ export class Separator extends Action {
 	constructor(label?: string) {
 		super(Separator.ID, label, label ? 'separator text' : 'separator');
 		this.checked = false;
-		this.radio = false;
 		this.enabled = false;
 	}
 }
diff --git a/src/vs/base/common/actions.ts b/src/vs/base/common/actions.ts
index e6e769ea897952dc72c8526073eeedc763231228..135008aa81d174b86fee7ce6699eb6386ef85bcb 100644
--- a/src/vs/base/common/actions.ts
+++ b/src/vs/base/common/actions.ts
@@ -29,7 +29,6 @@ export interface IAction extends IDisposable {
 	class: string | undefined;
 	enabled: boolean;
 	checked: boolean;
-	radio: boolean;
 	run(event?: any): Promise<any>;
 }
 
@@ -54,7 +53,6 @@ export interface IActionChangeEvent {
 	readonly class?: string;
 	readonly enabled?: boolean;
 	readonly checked?: boolean;
-	readonly radio?: boolean;
 }
 
 export class Action extends Disposable implements IAction {
@@ -68,7 +66,6 @@ export class Action extends Disposable implements IAction {
 	protected _cssClass: string | undefined;
 	protected _enabled: boolean = true;
 	protected _checked: boolean = false;
-	protected _radio: boolean = false;
 	protected readonly _actionCallback?: (event?: any) => Promise<any>;
 
 	constructor(id: string, label: string = '', cssClass: string = '', enabled: boolean = true, actionCallback?: (event?: any) => Promise<any>) {
@@ -152,14 +149,6 @@ export class Action extends Disposable implements IAction {
 		this._setChecked(value);
 	}
 
-	get radio(): boolean {
-		return this._radio;
-	}
-
-	set radio(value: boolean) {
-		this._setRadio(value);
-	}
-
 	protected _setChecked(value: boolean): void {
 		if (this._checked !== value) {
 			this._checked = value;
@@ -167,13 +156,6 @@ export class Action extends Disposable implements IAction {
 		}
 	}
 
-	protected _setRadio(value: boolean): void {
-		if (this._radio !== value) {
-			this._radio = value;
-			this._onDidChange.fire({ radio: value });
-		}
-	}
-
 	run(event?: any, _data?: ITelemetryData): Promise<any> {
 		if (this._actionCallback) {
 			return this._actionCallback(event);
diff --git a/src/vs/workbench/browser/parts/compositeBar.ts b/src/vs/workbench/browser/parts/compositeBar.ts
index 33495bbc8debbea12203e5cf55d8be2b61bf5c05..a0681d0c7f1ae4f18e0d51fe02c53d3e49148365 100644
--- a/src/vs/workbench/browser/parts/compositeBar.ts
+++ b/src/vs/workbench/browser/parts/compositeBar.ts
@@ -30,11 +30,12 @@ export interface ICompositeBarItem {
 }
 
 export interface ICompositeBarOptions {
-	icon: boolean;
-	orientation: ActionsOrientation;
-	colors: (theme: ITheme) => ICompositeBarColors;
-	compositeSize: number;
-	overflowActionSize: number;
+	readonly icon: boolean;
+	readonly orientation: ActionsOrientation;
+	readonly colors: (theme: ITheme) => ICompositeBarColors;
+	readonly compositeSize: number;
+	readonly overflowActionSize: number;
+
 	getActivityAction: (compositeId: string) => ActivityAction;
 	getCompositePinnedAction: (compositeId: string) => Action;
 	getOnCompositeClickAction: (compositeId: string) => Action;
diff --git a/src/vs/workbench/browser/parts/compositeBarActions.ts b/src/vs/workbench/browser/parts/compositeBarActions.ts
index e910ee428ea91c68116c4d449119cfb8d2cd592b..5ad81ef1e244eb62d859a557963b7d50059f5653 100644
--- a/src/vs/workbench/browser/parts/compositeBarActions.ts
+++ b/src/vs/workbench/browser/parts/compositeBarActions.ts
@@ -383,6 +383,7 @@ export class CompositeOverflowActivityActionViewItem extends ActivityActionViewI
 		this.contextMenuService.showContextMenu({
 			getAnchor: () => this.container,
 			getActions: () => this.actions,
+			getCheckedActionsRepresentation: () => 'radio',
 			onHide: () => dispose(this.actions)
 		});
 	}
@@ -390,7 +391,7 @@ export class CompositeOverflowActivityActionViewItem extends ActivityActionViewI
 	private getActions(): Action[] {
 		return this.getOverflowingComposites().map(composite => {
 			const action = this.getCompositeOpenAction(composite.id);
-			action.radio = this.getActiveCompositeId() === action.id;
+			action.checked = this.getActiveCompositeId() === action.id;
 
 			const badge = this.getBadge(composite.id);
 			let suffix: string | number | undefined;
@@ -614,8 +615,8 @@ export class CompositeActionViewItem extends ActivityActionViewItem {
 
 		this.contextMenuService.showContextMenu({
 			getAnchor: () => anchor,
-			getActionsContext: () => this.activity.id,
-			getActions: () => actions
+			getActions: () => actions,
+			getActionsContext: () => this.activity.id
 		});
 	}
 
diff --git a/src/vs/workbench/services/contextmenu/electron-browser/contextmenuService.ts b/src/vs/workbench/services/contextmenu/electron-browser/contextmenuService.ts
index 410b7e8ed509ec4af4c8d537d69c13d010f11f16..cea0688e45f495d7415c65637e247a8b82b550bf 100644
--- a/src/vs/workbench/services/contextmenu/electron-browser/contextmenuService.ts
+++ b/src/vs/workbench/services/contextmenu/electron-browser/contextmenuService.ts
@@ -138,10 +138,19 @@ class NativeContextMenuService extends Disposable implements IContextMenuService
 
 		// Normal Menu Item
 		else {
+			let type: 'radio' | 'checkbox' | undefined = undefined;
+			if (!!entry.checked) {
+				if (typeof delegate.getCheckedActionsRepresentation === 'function') {
+					type = delegate.getCheckedActionsRepresentation(entry);
+				} else {
+					type = 'checkbox';
+				}
+			}
+
 			const item: IContextMenuItem = {
 				label: unmnemonicLabel(entry.label),
-				checked: !!entry.checked || !!entry.radio,
-				type: !!entry.checked ? 'checkbox' : !!entry.radio ? 'radio' : undefined,
+				checked: !!entry.checked,
+				type,
 				enabled: !!entry.enabled,
 				click: event => {
 
@@ -188,4 +197,4 @@ class NativeContextMenuService extends Disposable implements IContextMenuService
 	}
 }
 
-registerSingleton(IContextMenuService, ContextMenuService, true);
\ No newline at end of file
+registerSingleton(IContextMenuService, ContextMenuService, true);