static RibbonGalleryItem()
{
Type ownerType = typeof(RibbonGalleryItem);
DefaultStyleKeyProperty.OverrideMetadata(ownerType, new FrameworkPropertyMetadata(ownerType));
ContentProperty.OverrideMetadata(ownerType, new FrameworkPropertyMetadata(null, new PropertyChangedCallback(OnContentChanged), new CoerceValueCallback(CoerceContent)));
ToolTipProperty.OverrideMetadata(ownerType, new FrameworkPropertyMetadata(null, new CoerceValueCallback(RibbonHelper.CoerceRibbonToolTip)));
ToolTipService.ShowOnDisabledProperty.OverrideMetadata(ownerType, new FrameworkPropertyMetadata(true));
EventManager.RegisterClassHandler(ownerType, KeyTipService.ActivatingKeyTipEvent, new ActivatingKeyTipEventHandler(OnActivatingKeyTipThunk));
EventManager.RegisterClassHandler(ownerType, KeyTipService.KeyTipAccessedEvent, new KeyTipAccessedEventHandler(OnKeyTipAccessedThunk));
}