/**
* Returns the root widget defined in the widget doc, assuming it is a container widget.
* If the root widget is NOT a container, this method will throw an exception.
* The caller takes ownership of the widget.
* This function can only be called once per widget doc instance!
*/
public WidgetContainer GetRootContainer()
{
Trace.Assert(_rootWidget != null);
if (!_rootWidget.IsContainer())
{
throw new Exception($"Expected root widget in '{_path}' to be a container.");
}
return((WidgetContainer)_rootWidget);
}
