... Value property. In a LinearPointKeyFrame it’s a Point, in a DoubleKeyFrame it’s a double, and so on. You can create a more interesting example using a series of key frames. The following animation ... defined here. > </Canvas> </UserControl> With this code in place, you could insert a bomb into your window using a <bomb:Bomb> element, much as the main window inserts ... RepeatBehavior="Forever" > <LinearPointKeyFrame Value="0.7,0 .3& quot; KeyTime="0:0:0"></LinearPointKeyFrame> <LinearPointKeyFrame Value="0 .3, 0.7" KeyTime="0:0:10"></LinearPointKeyFrame>...