void CubeTransitionApp::GoToNextImage()
{
  mNextTexture = LoadStageFillingTexture( IMAGES[ mIndex ] );
  mCurrentEffect.SetTargetTexture( mNextTexture );
  mIsImageLoading = false;
  mCurrentEffect.StartTransition( mPanPosition, mPanDisplacement );
  mCurrentTexture = mNextTexture;
}
void CubeTransitionApp::OnImageLoaded(ResourceImage image)
{
   mIsImageLoading = false;
   mCurrentEffect.StartTransition( mPanPosition, mPanDisplacement );
   mCurrentImage = mNextImage;
}