createSidebarPane method
Creates a pane within panel's sidebar.
title Text that is displayed in sidebar caption.
returns A callback invoked when the sidebar is created.
Implementation
Future<ExtensionSidebarPane> createSidebarPane(String title) async {
var $res = await _wrapped.createSidebarPane(title).toDart;
return ExtensionSidebarPane.fromJS($res);
}