The fix is available with lib version 2015.2.907.
Fixed with LIB version 2015.2.817.
Should be resolved with lib version 2014.3.1124.
BindingMode is OneWay when there is editor template and PropertySetMode is None Resolved with LIB version 2014.1.407.
InvalidCastException is thrown when binding PropertyGrid.Item to collection. The exception is thrown in \\Core\Data\Extensions\FuncExtensions.cs. Unable to cast object of type 'System.Collections.Generic.List`1[System.Windows.Window]' to type 'Telerik.Windows.Controls.Data.PropertyGrid.PropertySet'. Resolved with LIB version 2014.1.317