diff --git a/src/vs/base/browser/ui/sash/sash.ts b/src/vs/base/browser/ui/sash/sash.ts
index 14661a0e54c..1da837bb7a6 100644
--- a/src/vs/base/browser/ui/sash/sash.ts
+++ b/src/vs/base/browser/ui/sash/sash.ts
@@ -52,16 +52,39 @@ export class Sash {
 
 	private el: HTMLElement;
 	private layoutProvider: ISashLayoutProvider;
-	private isDisabled: boolean;
 	private hidden: boolean;
 	private orientation: Orientation;
 	private size: number;
 	private disposables: IDisposable[] = [];
 
-	private _onDidStart = new Emitter<ISashEvent>();
-	private _onDidChange = new Emitter<ISashEvent>();
-	private _onDidReset = new Emitter<void>();
-	private _onDidEnd = new Emitter<void>();
+	private _enabled = true;
+	get enabled(): boolean { return this._enabled; }
+	set enabled(enabled: boolean) {
+		this._enabled = enabled;
+
+		if (enabled) {
+			removeClass(this.el, 'disabled');
+		} else {
+			addClass(this.el, 'disabled');
+		}
+
+		this._onDidEnablementChange.fire(enabled);
+	}
+
+	private readonly _onDidEnablementChange = new Emitter<boolean>();
+	readonly onDidEnablementChange: Event<boolean> = this._onDidEnablementChange.event;
+
+	private readonly _onDidStart = new Emitter<ISashEvent>();
+	readonly onDidStart: Event<ISashEvent> = this._onDidStart.event;
+
+	private readonly _onDidChange = new Emitter<ISashEvent>();
+	readonly onDidChange: Event<ISashEvent> = this._onDidChange.event;
+
+	private readonly _onDidReset = new Emitter<void>();
+	readonly onDidReset: Event<void> = this._onDidReset.event;
+
+	private readonly _onDidEnd = new Emitter<void>();
+	readonly onDidEnd: Event<void> = this._onDidEnd.event;
 
 	constructor(container: HTMLElement, layoutProvider: ISashLayoutProvider, options: ISashOptions = {}) {
 		this.el = append(container, $('.monaco-sash'));
@@ -85,27 +108,10 @@ export class Sash {
 
 		this.setOrientation(options.orientation || Orientation.VERTICAL);
 
-		this.isDisabled = false;
 		this.hidden = false;
 		this.layoutProvider = layoutProvider;
 	}
 
-	get onDidStart(): Event<ISashEvent> {
-		return this._onDidStart.event;
-	}
-
-	get onDidChange(): Event<ISashEvent> {
-		return this._onDidChange.event;
-	}
-
-	get onDidReset(): Event<void> {
-		return this._onDidReset.event;
-	}
-
-	get onDidEnd(): Event<void> {
-		return this._onDidEnd.event;
-	}
-
 	setOrientation(orientation: Orientation): void {
 		this.orientation = orientation;
 
@@ -127,7 +133,7 @@ export class Sash {
 	private onMouseDown(e: MouseEvent): void {
 		EventHelper.stop(e, false);
 
-		if (this.isDisabled) {
+		if (!this.enabled) {
 			return;
 		}
 
@@ -279,20 +285,6 @@ export class Sash {
 		return this.hidden;
 	}
 
-	enable(): void {
-		removeClass(this.el, 'disabled');
-		this.isDisabled = false;
-	}
-
-	disable(): void {
-		addClass(this.el, 'disabled');
-		this.isDisabled = true;
-	}
-
-	get enabled(): boolean {
-		return !this.isDisabled;
-	}
-
 	dispose(): void {
 		if (this.el && this.el.parentElement) {
 			this.el.parentElement.removeChild(this.el);
diff --git a/src/vs/base/browser/ui/splitview/splitview.ts b/src/vs/base/browser/ui/splitview/splitview.ts
index defd246af80..000e3aacec3 100644
--- a/src/vs/base/browser/ui/splitview/splitview.ts
+++ b/src/vs/base/browser/ui/splitview/splitview.ts
@@ -461,11 +461,7 @@ export class SplitView implements IDisposable {
 		const expandsUp = reverseViews.map(i => previous = (i.view.maximumSize - i.size > 0) || previous).reverse();
 
 		this.sashItems.forEach((s, i) => {
-			if ((collapsesDown[i] && expandsUp[i + 1]) || (expandsDown[i] && collapsesUp[i + 1])) {
-				s.sash.enable();
-			} else {
-				s.sash.disable();
-			}
+			s.sash.enabled = (collapsesDown[i] && expandsUp[i + 1]) || (expandsDown[i] && collapsesUp[i + 1]);
 		});
 	}
 
diff --git a/src/vs/editor/browser/widget/diffEditorWidget.ts b/src/vs/editor/browser/widget/diffEditorWidget.ts
index ad3e0569197..76a2ebb47a3 100644
--- a/src/vs/editor/browser/widget/diffEditorWidget.ts
+++ b/src/vs/editor/browser/widget/diffEditorWidget.ts
@@ -1520,7 +1520,7 @@ class DiffEdtorWidgetSideBySide extends DiffEditorWidgetStyle implements IDiffEd
 		this._sash = this._register(new Sash(this._dataSource.getContainerDomNode(), this));
 
 		if (this._disableSash) {
-			this._sash.disable();
+			this._sash.enabled = false;
 		}
 
 		this._sash.onDidStart(() => this.onSashDragStart());
@@ -1539,9 +1539,9 @@ class DiffEdtorWidgetSideBySide extends DiffEditorWidgetStyle implements IDiffEd
 			this._disableSash = newDisableSash;
 
 			if (this._disableSash) {
-				this._sash.disable();
+				this._sash.enabled = false;
 			} else {
-				this._sash.enable();
+				this._sash.enabled = true;
 			}
 		}
 	}
diff --git a/src/vs/editor/contrib/zoneWidget/zoneWidget.ts b/src/vs/editor/contrib/zoneWidget/zoneWidget.ts
index 784aac39e55..832bbfe86b1 100644
--- a/src/vs/editor/contrib/zoneWidget/zoneWidget.ts
+++ b/src/vs/editor/contrib/zoneWidget/zoneWidget.ts
@@ -459,7 +459,7 @@ export abstract class ZoneWidget implements IHorizontalSashLayoutProvider {
 
 		if (!this.options.isResizeable) {
 			this._resizeSash.hide();
-			this._resizeSash.disable();
+			this._resizeSash.enabled = false;
 		}
 
 		let data: { startY: number; heightInLines: number; };