public override Size GetPreferredSize(ViewLayoutContext context)
{
// Get the preferred size of check box view
Size preferredSize = base.GetPreferredSize(context);
if (_currentSize == GroupItemSize.Large)
preferredSize.Height = _ribbon.CalculatedValues.GroupTripleHeight;
else
preferredSize.Height = _ribbon.CalculatedValues.GroupLineHeight;
return preferredSize;
}