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Retrieving the mouse position relative to controls on a Window

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="MouseInput" Height="300" Width="300">     <Grid>       <Ellipse Fill="Blue" x:Name="myEllipse" />     </Grid> </Window> //File:Window.xaml.vb Imports System Imports System.Collections.Generic Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Imports System.Diagnostics Namespace WpfApplication1   Public Partial Class Window1     Inherits System.Windows.Window     Public Sub New()       InitializeComponent()     End Sub     Protected Overrides Sub OnMouseMove(e As MouseEventArgs)       MyBase.OnMouseMove(e)       Dim positionRelativeToEllipse As Point = Mouse.GetPosition(myEllipse)       Debug.WriteLine("Window.MouseMove: " & Convert.ToString(positionRelativeToEllipse))     End Sub   End Class End Namespace