Gets or sets the y-axis value of the top side of the rectangle.
Public Property Y As Double
You can set this value in XAML, but only as part of the attribute syntax for properties that take a Rect, or as initialization text of a Rect object element. See XAML sections and Remarks sections of Rect.
X, Y, Width, and Height can be negative. See Remarks in Rect.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.