public: DependencyProperty HeaderProperty = DependencyProperty.Register("Header", typeof(string), typeof(RibbonGroup), new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.AffectsRender));

public static readonly DependencyProperty HeaderProperty = DependencyProperty.Register("Header", typeof(string), typeof(RibbonGroup), new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.AffectsRender));

Public static readonly HeaderProperty As DependencyProperty = DependencyProperty.Register("Header", typeof(string), typeof(RibbonGroup), new FrameworkPropertyMetadata("", FrameworkPropertyMetadataOptions.AffectsRender))