1 files changed, 2 insertions, 2 deletions
diff --git a/src/client/views/MainView.tsx b/src/client/views/MainView.tsx
index 50f451c0a..8e112dddb 100644
--- a/src/client/views/MainView.tsx
+++ b/src/client/views/MainView.tsx
@@ -10,7 +10,7 @@ import 'normalize.css';
 import * as React from 'react';
 import { Doc, DocListCast, Opt } from '../../fields/Doc';
 import { ScriptField } from '../../fields/ScriptField';
-import { StrCast } from '../../fields/Types';
+import { DocCast, StrCast } from '../../fields/Types';
 import { emptyFunction, returnEmptyDoclist, returnEmptyFilter, returnFalse, returnTrue, returnZero, setupMoveUpEvents, Utils } from '../../Utils';
 import { GoogleAuthenticationManager } from '../apis/GoogleAuthenticationManager';
 import { DocServer } from '../DocServer';
@@ -854,7 +854,7 @@ export class MainView extends React.Component {
         this._leftMenuFlyoutWidth = this._leftMenuFlyoutWidth || 250;
         //setTimeout(action(() => (this._leftMenuFlyoutWidth += 0.5)));
 
-        this._sidebarContent.proto = button.target as any;
+        this._sidebarContent.proto = DocCast(button.target);
         this.LastButton = button;
     });