catching spin buttons at button release?

xforms has this handy option to only pick up changes in control
widgets at the end of a modification, thus avoiding a mass of changes
while the user plays with slider/button/whatever.

i don't suppose anyone can think of a handy way to do this with a spin
button? i'd like to just find out when the user releases the chosen
spin button (or activates the entry), and then grab the value from the


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