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I would like to perform a postback when the droplistlist selected value changes, but only if it was changed via expanding the downdown and clicking an option, not is the user tabs to the control and uses the arrow keys. The reason for this is simple, keyboard accessibility.
Postbacks are triggered using __doPostBack(‘uniqueidofcontrol’, ‘commandname’); so when the list changes value (I believe in onchange event), it posts to the server. You would need to not set autopostback. What you would need to do is tap into the click event (if there is one) and then call __doPostBack(..) method upon that event.
HTH.