'宣言 Protected Property VisualScrollableAreaClip As System.Nullable(Of Rect)
'使用法 Dim instance As ParametersView Dim value As System.Nullable(Of Rect) instance.VisualScrollableAreaClip = value value = instance.VisualScrollableAreaClip
protected System.Nullable<Rect> VisualScrollableAreaClip {get; set;}