Keyboard Navigation accessibility Question

Hello people,

I have a an image tied to a trigger that toggles the state of a variable.  That is all working as expected.  The problem is that when I try to navigate with my keyboard, and my image gains focus, I cannot press the [space bar] or [enter] key to activate the trigger (the way that a button would).  But it seems to me that attaching a trigger to an image SHOULD work that way.  I know I can replace the image with a standard button, but I want to use my custom image.  Am I maybe missing some simple little trick of the trade?

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