Configure a layout: slide-in panes

A layout can have a slide-in pane configured at each side of a layout window. During runtime, slide-in panes are hidden until the user selects the tab at the side of a layout to extend the slide-in pane and show its contents. In the example below, selecting the tab at the left border of the layout shows a NavTree control in a slide-in pane. Clicking or tapping outside of the slide-in pane hides it