This is a must have. Sooner rather than later please!
In order to be able to use the Paner Bar as an assistant, or to be more polivalent as such, I think that this would be a nice feature to boost the use of Panel Bar
It would be nice If we could bind panel bar with local data properties.
Fixed height accordians / panels. http://jqueryui.com/demos/accordion/#fillspace
It would be awesome if the PanelBar had data binding capability like treeView.
Add MVVM support for PanelBar, so sections can be added dynamicaly from ViewModel. Currently no MVVM support exists for PanelBar, but there is already MVVM support implemented for TreeView (both of them use hierarchical datasource).