Diable Image caching in WP7

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Mobile

Windows-Phone-7

I am having a horrible time with the automatic image caching by WP7 platform.

I made a very simple app (I mean real simple). They have 2 images already added in solution as content of pix dimension 1280 x 2000 Here is XAML

<Grid x:Name="LayoutRoot" removed="Transparent" ManipulationCompleted="ImageHolder_ManipulationCompleted">
        <Image x:Name="ImageHolder" />
        <TextBlock x:Name="MemoryUsage" />
</Grid>

My .cs

ImageHolder.Source = null;
      if (i % 2 == 0)
           ImageHolder.Source = new BitmapImage(new Uri("image002.jpg", UriKind.Relative));
      else
           ImageHolder.Source = new BitmapImage(new Uri("image001.jpg", UriKind.Relative));
            i++;

            MemoryUsage.Text = "Device Total Memory = " + (long)DeviceExtendedProperties.GetValue("DeviceTotalMemory") / (1024 * 1024)
                + "\nCurrent Memory Usage = " + (long)DeviceExtendedProperties.GetValue("ApplicationCurrentMemoryUsage") / (1024 * 1024)
                + "\nPeak Memory Usage = " + (long)DeviceExtendedProperties.GetValue("ApplicationPeakMemoryUsage") / (1024 * 1024);

Memory usage is very high is equal to the 2 images in raw bitmap size, though there should only be one such instance. Please help, I am in dire need.