Gets or sets the width, in pixels, of the upper side of the bounding rectangle.
Assembly: System.Windows (in System.Windows.dll)
You can set this value in XAML, but only as part of the attribute syntax for properties that take a Thickness, or as initialization text of a Thickness object element. See XAML sections and Remarks sections of Thickness.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.