delphi firemonkey: how to use image area as a button?

  

in my Firemonkey android app, i want to use a area( or an object ) in an image(image is placed in a form) as a button, first i thought about getting touch/click area and process from there, but since device screen could change from device to device, i want to know how to handle this situation ..

just for demonstration see this picture

i want to use each item as a button.

how do i do that ? thanks in advance.

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