No ExpandButton when NavigationPane is minimized

May 24, 2013 at 4:07 PM
In the NavigationPaneDemo when the NavigationPane is minimized and you hover over the BarTitle The Title changes into a (Expand?)Button. When you click this button the contents of the selected NavigationPaneItem is displayed to the right of the NavigationPane.

For reasons (still) unknown to me I cannot get this behaviour in my WPF project. I have compared all properties and themes and have stripped the demo to it's bare minimum to see where this behaviour is switched on or off. But still I can't get it to work. My BarTitle remains flat when the mouse moves over it and when clicked nothing happens.

Can someone give me some guidance on what to do next?