How to catch combobox dropdown/popup event?

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How to catch combobox dropdown/popup event?

 

Hi, ALL,
This is my first post, so please forgive me for something I don't know... ;-)

On this link: http://www.opengroup.org/openmotif/docs/m214a.pdf it mentioned that you can use CBDropDownList() in order to handle combo box dropdown/popup events. However I can't seems to find out what XEvent I need to react in order to handle those events.

Can somebody help me with this? I want to catch mouse clicks as well as keyboard events...

Thank you.

 

 

Why do you need to use the

Why do you need to use the internal actions? Why can't you just use the XmNselectionCallback?
--
Fred K