cs代码实现控件移动TranslateTransform

xaml：
 <Rectangle>
            <Rectangle.RenderTransform>
                <TranslateTransform x:Name="myTranslateTransform" />
            </Rectangle.RenderTransform>
 </Rectangle>

cs:

myTranslateTransform.X = myTranslateTransform.X + 15;
myTranslateTransform.Y = myTranslateTransform.Y + 15;

http://msdn.microsoft.com/en-us/library/windows/apps/system.windows.media.translatetransform%28v=vs.105%29.aspx