After tries of XNA and Silverlight methods, this one can show the Position of Mouse and it will show the position relative to any Framework Element too with high performance:
Private Touch As System.Windows.Input.Touch
Public Sub New()
InitializeComponent()
AddHandler System.Windows.Input.Touch.FrameReported, AddressOf Touch_FrameReported
End Sub
Private Sub Touch_FrameReported(sender As Object, e As TouchFrameEventArgs)
If Me.DragElement IsNot Nothing Then
_MousePosition = e.GetPrimaryTouchPoint(Me.ucGameCanvas1).Position ' will return 400,240 as needed if user press in the middle of the screen
End If
End Sub