The Pane Title accompanies the pane, provides meta information about the pane's series, and allows end users to hide/show the pane.
The pane title consists of a content control and a expand/collapse indicator:
How to: Show the Pane Title
A pane shows a custom title when you assign a PaneTitle object to the pane, or the default title when you do not specify the title and collapse the pane.
The markup below produces the pane titles in the previous image.