set a new window to glimagesink

[stic at free.fr]

Hi,

Is there a way the set a new window to a glimagesink element ?
Once the pipeline is created I can display video by using gst_video_overlay_set_window_handle on the glimagesink.
But while the pipeline is running I am trying to change to another window by using again gst_video_overlay_set_window_handle with the new window, but it doesn't seem to work, the screen becomes black.

Do I have to block pads to do this or something else ??

Thank you very much for any help.