Memory leak problem in Thumb control

Question

I think I have detected a new problem with memory leak in Silverlight 4. Now, this new problem has been detected in Thumb control.

I have created a new Silverlight 4 application with three pages:
- MainPage: With a content control, and three buttons. The first button load the Page1 in the content control. The second button load the Page 2 in the content control. And the last button will call ten times to GC.Collect() and GC.WaitForPendingFinalizers().
- Page1: Empty page.
- Page2:

XAML:

 

    <Grid x:Name="LayoutRoot" Background="Pink" Width="400" Height="400">
       
        <Thumb x:Name="myThumbStart" 
               Grid.Row="0"
               Height="50" 
               HorizontalAlignment="Left" 
               VerticalAlignment="Top" 
               Width="50" 
               DragDelta="myThumbStart_DragDelta" 
               >
        </Thumb>
        
    </Grid>

 

Code behind:

  

    public partial class DualSlider3 : UserControl
    {

        public DualSlider3()
        {
            InitializeComponent();
        }


        private void myThumbStart_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
        {
            double newMarginLeft = myThumbStart.Margin.Left + e.HorizontalChange;

            if ((newMarginLeft >= 0) && (this.LayoutRoot.ActualWidth > (newMarginLeft + myThumbStart.ActualWidth)))
            {
                myThumbStart.Margin = new Thickness(newMarginLeft, 0, 0, 0);
            }
        }


    }

 

If I load the Page2 and I move the Thumb control doing drag with mouse from left side to right side several times, when I load the Page1 and press GC button, the Page2 (and all its content) is not removed from memory. I checked it with WinDbg.

Can anybody test this problem?

Answer 1

Its exactly the same bug which I already posted here. It affects nearly every drag & drop operation. Hope we get an answer this time...