// Display the current mouse position for the Rectangle object.
function onMouseMove(sender, mouseEventArgs)
{
    var msg = "x:y = " + mouseEventArgs.getPosition(null).x + ", " + mouseEventArgs.getPosition(null).y;
    sender.findName("statusTextBlock").Text = sender.Name + ": " + msg;
}

// Enable mouse capture when the mouse is depressed over the green Rectangle object.
function onLeftButtonDown(greenRect, mouseEventArgs) 
{
    greenRect.captureMouse();
}

// Disable mouse capture when the mouse is released over the green Rectangle object.
function onLeftButtonUp(greenRect, mouseEventArgs) 
{
    greenRect.releaseMouseCapture();
}