Manage video memory with GPU rendering

Hello,

I was wondering if there is a direct way to manage/delte stored textures on the GPU in the current version of AIR for mobile.

As of now, if my game runs out of GPU memory, the framerate dives to an unrecoverable 10fps, and the only way to get it back is to restart the app.

Are there practices for preventing this? Does AIR manage the video memory itself based on which bitmaps/movieclips are visible and being drawn on the stage at a certain time?

Thanks