diff --git a/src/vs/base/browser/ui/list/listPaging.ts b/src/vs/base/browser/ui/list/listPaging.ts
index 88868fa4865..51129e1bd97 100644
--- a/src/vs/base/browser/ui/list/listPaging.ts
+++ b/src/vs/base/browser/ui/list/listPaging.ts
@@ -118,7 +118,7 @@ export class PagedList<T> implements IDisposable {
 	}
 
 	get onOpen(): Event<IListEvent<T>> {
-		return Event.map(this.list.onOpen, ({ elements, indexes, browserEvent }) => ({ elements: elements.map(e => this._model.get(e)), indexes, browserEvent }));
+		return Event.map(this.list.onDidOpen, ({ elements, indexes, browserEvent }) => ({ elements: elements.map(e => this._model.get(e)), indexes, browserEvent }));
 	}
 
 	get onSelectionChange(): Event<IListEvent<T>> {
diff --git a/src/vs/base/browser/ui/list/listWidget.ts b/src/vs/base/browser/ui/list/listWidget.ts
index 2a434533de8..8f913980a8b 100644
--- a/src/vs/base/browser/ui/list/listWidget.ts
+++ b/src/vs/base/browser/ui/list/listWidget.ts
@@ -949,8 +949,8 @@ export class List<T> implements ISpliceable<T>, IDisposable {
 		return Event.map(this.eventBufferer.wrapEvent(this.selection.onChange), e => this.toListEvent(e));
 	}
 
-	private _onOpen = new Emitter<IListEvent<T>>();
-	readonly onOpen: Event<IListEvent<T>> = this._onOpen.event;
+	private _onDidOpen = new Emitter<IListEvent<T>>();
+	readonly onDidOpen: Event<IListEvent<T>> = this._onDidOpen.event;
 
 	private _onPin = new Emitter<number[]>();
 	@memoize get onPin(): Event<IListEvent<T>> {
@@ -1315,7 +1315,7 @@ export class List<T> implements ISpliceable<T>, IDisposable {
 			}
 		}
 
-		this._onOpen.fire({ indexes, elements: indexes.map(i => this.view.element(i)), browserEvent });
+		this._onDidOpen.fire({ indexes, elements: indexes.map(i => this.view.element(i)), browserEvent });
 	}
 
 	pin(indexes: number[]): void {
@@ -1361,7 +1361,7 @@ export class List<T> implements ISpliceable<T>, IDisposable {
 		this._onDidDispose.fire();
 		this.disposables = dispose(this.disposables);
 
-		this._onOpen.dispose();
+		this._onDidOpen.dispose();
 		this._onPin.dispose();
 		this._onDidDispose.dispose();
 	}
diff --git a/src/vs/base/browser/ui/tree/abstractTree.ts b/src/vs/base/browser/ui/tree/abstractTree.ts
index 3b258194d0b..4d6bf592852 100644
--- a/src/vs/base/browser/ui/tree/abstractTree.ts
+++ b/src/vs/base/browser/ui/tree/abstractTree.ts
@@ -190,6 +190,7 @@ export abstract class AbstractTree<T, TFilterData, TRef> implements IDisposable
 
 	get onDidChangeFocus(): Event<ITreeEvent<T>> { return Event.map(this.view.onFocusChange, asTreeEvent); }
 	get onDidChangeSelection(): Event<ITreeEvent<T>> { return Event.map(this.view.onSelectionChange, asTreeEvent); }
+	get onDidOpen(): Event<ITreeEvent<T>> { return Event.map(this.view.onDidOpen, asTreeEvent); }
 
 	get onMouseClick(): Event<ITreeMouseEvent<T>> { return Event.map(this.view.onMouseClick, asTreeMouseEvent); }
 	get onMouseDblClick(): Event<ITreeMouseEvent<T>> { return Event.map(this.view.onMouseDblClick, asTreeMouseEvent); }
diff --git a/src/vs/base/browser/ui/tree/asyncDataTree.ts b/src/vs/base/browser/ui/tree/asyncDataTree.ts
index f176c74a8a5..1660d433644 100644
--- a/src/vs/base/browser/ui/tree/asyncDataTree.ts
+++ b/src/vs/base/browser/ui/tree/asyncDataTree.ts
@@ -186,6 +186,7 @@ export class AsyncDataTree<T extends NonNullable<any>, TFilterData = void> imple
 
 	get onDidChangeFocus(): Event<ITreeEvent<T>> { return Event.map(this.tree.onDidChangeFocus, asTreeEvent); }
 	get onDidChangeSelection(): Event<ITreeEvent<T>> { return Event.map(this.tree.onDidChangeSelection, asTreeEvent); }
+	get onDidOpen(): Event<ITreeEvent<T>> { return Event.map(this.tree.onDidOpen, asTreeEvent); }
 	get onDidChangeCollapseState(): Event<T> { return Event.map(this.tree.onDidChangeCollapseState, e => e.element!.element!); }
 
 	private readonly _onDidResolveChildren = new Emitter<IChildrenResolutionEvent<T>>();
diff --git a/src/vs/workbench/parts/debug/browser/breakpointsView.ts b/src/vs/workbench/parts/debug/browser/breakpointsView.ts
index eb0b589dde0..44614a05825 100644
--- a/src/vs/workbench/parts/debug/browser/breakpointsView.ts
+++ b/src/vs/workbench/parts/debug/browser/breakpointsView.ts
@@ -83,7 +83,7 @@ export class BreakpointsView extends ViewletPanel {
 
 		this.list.onContextMenu(this.onListContextMenu, this, this.disposables);
 
-		this.disposables.push(this.list.onOpen(e => {
+		this.disposables.push(this.list.onDidOpen(e => {
 			let isSingleClick = false;
 			let isDoubleClick = false;
 			let isMiddleClick = false;
diff --git a/src/vs/workbench/parts/files/electron-browser/views/openEditorsView.ts b/src/vs/workbench/parts/files/electron-browser/views/openEditorsView.ts
index f289aff9e74..400f005c7d4 100644
--- a/src/vs/workbench/parts/files/electron-browser/views/openEditorsView.ts
+++ b/src/vs/workbench/parts/files/electron-browser/views/openEditorsView.ts
@@ -256,7 +256,7 @@ export class OpenEditorsView extends ViewletPanel {
 				e.element.group.closeEditor(e.element.editor);
 			}
 		}));
-		this.disposables.push(this.list.onOpen(e => {
+		this.disposables.push(this.list.onDidOpen(e => {
 			const browserEvent = e.browserEvent;
 
 			let openToSide = false;
diff --git a/src/vs/workbench/parts/scm/electron-browser/scmViewlet.ts b/src/vs/workbench/parts/scm/electron-browser/scmViewlet.ts
index 50363bab399..0c9e2165219 100644
--- a/src/vs/workbench/parts/scm/electron-browser/scmViewlet.ts
+++ b/src/vs/workbench/parts/scm/electron-browser/scmViewlet.ts
@@ -879,7 +879,7 @@ export class RepositoryPanel extends ViewletPanel {
 			keyboardNavigationLabelProvider: scmKeyboardNavigationLabelProvider
 		}) as WorkbenchList<ISCMResourceGroup | ISCMResource>;
 
-		Event.chain(this.list.onOpen)
+		Event.chain(this.list.onDidOpen)
 			.map(e => e.elements[0])
 			.filter(e => !!e && isSCMResource(e))
 			.on(this.open, this, this.disposables);