Get image mouse click position in App Designer

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I'm trying to create an app in App Designer where I display an image on a UIAxes and then capture the position of the mouse when a user clicks on that image and then display the captured mouse position in an edit field. I have created a ButtonDownFcn associated with the image but when I click on the image I get:
Undefined function 'im_ButtonDownFcn' for input arguments of type ''.
Error while evaluating Image ButtonDownFcn.
My code is attached, any help would be much appreciated.

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