static SplitButton()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(SplitButton), new FrameworkPropertyMetadata(typeof(SplitButton)));
FocusVisualStyleProperty.OverrideMetadata(typeof(SplitButton), new FrameworkPropertyMetadata(null));
StyleProperty.OverrideMetadata(typeof(SplitButton), new FrameworkPropertyMetadata(null, new CoerceValueCallback(OnCoerceStyle)));
}