not sure, but if you're aim is multiselect, then have a look at UI-Element 'listbox' instead of a dropdown list ...
Hope this'll be of some help
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You can't do checkboxes in lists. If you mean a checkmark, that's possible in listboxes, as Hans-Gerd suggested. See http://www.kahrel.plus.com/indesign/scriptui.html, p. 28, for details.
Thanks to both for the reply, I want the OnChange event for the user selecting the list items in listBox UI, Is there any events for list items has selected? so that i will changing the listbox.items.checked = true; or false.
This will be possible?
I'm not sure that I understand what you mean, but I think the answer is yes, that's possible. Why don't you go through the guide I mentioned earlier -- it has several examples of processing listboxes, including the use of the onChange handler.
I referred the pdf only in p.28 as you suggested, sorry for the mistaken. Yes listboxes having the onchange handler. Thanks.