We are trying to use custom styling for the RadPane control, using the last release of Telerik RadControls for Silverlight (Dec. 2011).
We made test project by extracting the default style of RadPane using Blend, and we saw that every time we pin the RadPane it loose its style.
Attached a simple project that colored the backgroud in a different color for each state, you can see that all the panes have colors in the beginning and after they are pinned they loose their colors.
We will appreciate a quick response,
Link to the project: