WPF功能区：DataTemplate导致BindingExpression路径错误

I've run into a small problem using the WPF RibbonControl (October 2010 version). My idea was to bind the ItemsSource property of a RibbonGroup to my viewmodel, and use a DataTemplate to create RibbonButtons as needed. This works, but it causes a binding error (one for each button) when you show the window:I've run into a small problem using the WPF Rib