This is a bug fix release. It fixes a single bug with the GroupBox control.
- Convention suggests that a loaded event is raised after the control's measure and layout pass have been completed but before the control is rendered. However the GroupBox control could change it's content presenter padding in it's own loaded event handler. This could cause a size changed event. While this didn't cause any issues with rendering or hit testing, if an application was recording the position of it's controls from with in it's own loaded event, the position of any controls below a GroupBox could subsequently change position unexpectedly.