<ItemsControl x:Name="ic_EdgeLine" Grid.Column="1" >
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <Canvas/>
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Line X1="{Binding A.PosOfEllipse.X }" Y1="{Binding A.PosOfEllipse.Y }" X2="{Binding B.PosOfEllipse.X }" Y2="{Binding B.PosOfEllipse.Y}" Stroke="Black" StrokeThickness="2"/>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

private void BtEl1_MouseRightButtonUp(object sender, MouseButtonEventArgs e)
  {

     var p = sender as Ellipse;
     posOfEl = p.TransformToVisual(ic_canvas).Transform(new Point(p.ActualHeight / 2, p.ActualWidth / 2));
     output = new EllipseOfElement { EllipseOfUC = p, PosOfEllipse = posOfEl };

     connect = new EdgeLine { A = input, B = output };
     Edgeln.Add(connect);


  }

  private void ResEl1_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
  {

     var p = sender as Ellipse;
     posOfEl = p.TransformToVisual(ic_canvas).Transform(new Point(p.ActualHeight / 2, p.ActualWidth / 2));
     input = new EllipseOfElement { EllipseOfUC = p, PosOfEllipse = posOfEl };


  }