Commented Issue: WP7.5 Silverlight/XNA LongListSelector GroupItemsPanel problem [10825]

The LongListSelector works fine in a Silverlight/XNA combo project with one exception (so far).

When tapping a group item in the list, nothing gets displayed. You can still swipe up and down to scroll the list. However, the Back button becomes inoperative unless I stop displaying the LongListSelector (I have a permanent button at the top of the screen that will Collapse the LongListSelector).

Now, if you hit the Back button, it works and you can go to the previous page. If that page is a plain Silverlight page, suddenly your LongListSelector GroupItemsPanel shows up and messes things up. At that point, only exiting the app via the Back button works for me.
Comments: ** Comment from web user: leemcpherson **

workaround: Use the events GroupViewOpened and GroupViewClosed

private void longListSelector_GroupViewOpened(object sender, GroupViewOpenedEventArgs e)
{
timer.Stop();
SharedGraphicsDeviceManager.Current.GraphicsDevice.SetSharingMode(false);
}

private void longListSelector_GroupViewClosing(object sender, GroupViewClosingEventArgs e)
{
SharedGraphicsDeviceManager.Current.GraphicsDevice.SetSharingMode(true);
timer.Start();
}