If you have a Border (or another Control) and wish to set the background dynamically using an ImageBrush and wish to use databinding to set the ImageSource, you will get a runtime error.
You cannot use databing to set the ImageSource on an ImageBrush!
To work around this issue you can bind the background on the border instead and use a ValueConverter to generate the ImageBrush dynamically.
That should do the trick :)
by xamlgeek