How to detect mouse input in ecto?

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Hello Ecto Gurus,

I have run through the various parts of the Ecto Kitchen (very cool!) and have succeeded in getting basic feature detection to work using both a webcam and a Kinect. I would like to be able to select rectangular regions on an imshow window with a mouse and use the selected region as a mask for feature detection. This is something that can be done with OpenCV using the SetMouseCallback() function. I tried that alongside the ecto code in my Python script, but it doesn't seem to fire when clicking and dragging on the ecto imshow window.

Is there a way to do this? I see the 'trigger' parameter for keyboard input but I'm not sure if this can be adapted for mouse input.

Thanks!
patrick