Shows the NavPane Form. This method is in effect if the Navigation Pane View is applied.
The NavPane Form (see NavBarControl.NavPaneForm) allows you to display the contents of the active group without expanding the collapsed NavBarControl. The NavPane Form is automatically shown if an end-user clicks the group's caption. You can also use the ShowNavPaneForm method to programmatically show the NavPane Form. To close the opened NavePane Form, call the NavBarControl.HideNavPaneForm method.