gst_x_overlay_expose crashes!!!

["Suma H S" <sumahs tataelxsi co in>]

hi,
I am using GStreamer for video application.
Moving the video window around damages its contents, 
so to force refresh, I am using the call
gst_x_overlay_expose(GST_X_OVERLAY(videosink)) in 
the expose event callback functiion.
But this function call causes the application to crash.
Any idea why this might be happening?

Thanks,
Suma H S





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