Panel with Toolbar
A layout panel may be created with a toolbar. It uses w2toolbar object, therefore, you can use anything w2toolbar support. There is no need to define a name of the toolbar, because it will be overwritten with layout.name + '_toolbar'. It will also add toolbar.owner attribute that is a reference to the layout.
You can dynamically load content into the main panel; this is done so you can observe the overflow behaviour of the panel (scrollbars).