Analog Way AW VIDEOCOMPOSITOR - LIVECORE PLATFORM - Ref. AWVDC Smart Graphics module - Manual (Page 9)

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The same issue can happen putting layers out of the VideoCompositor object bounds. Even if this is not
strictly forbidden, it is a good practice not to hide a layer by putting it “out of sight”. The best way to hide a
layer is to put its dimension to “0”:
Figure 5: The source panel can overlaps other widget in the same page
To avoid this problem, just give the video compositor the smallest z-order index as shown below:
Figure 6: VideoCompositor does no more break other widget interaction