A binding error occur in the output on Windows7 without aero.
(System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=IsActive; DataItem=null; target element is 'Button' (Name='PART_MinimizeWindowButton'); target property is 'NoTarget' (type 'Object'))

Available in LIB version: 2015.1.0604