I am developing an app on top of videoplayback sample app. In my start screen, I have different buttons. Some of them for showing 3d models and others for playing videos. When I show 3d model, the video playback and related textures should not be seen and vice versa.. i.e when I press video playing button, no 3d model should be seen. for 1st time it is working fine, but once i press back to go back to selection screen, 3d model or video is not getting removed. Can some one suggest me how to clean them when I press back button to go to selection screen.