>>Hi all !
>>I have a problem with combobox controls - when an user (using mouse) tries to change selected item sometimes the user action is ignored (selected item did not changes), especially when, before making the new selection, the combobox was scrolled (using mouse). It seems that sometimes an event is not executed.
>>It seems that this behavior existed in VFP8, but in VFP9sp1 is more apparent and much more annoying. Maybe someone has a solution of the problem ? Thanks in advance.
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>So when the user scrolls the list and then clicks on the selection arrow again, the item selected at that point does not register as being the new index value?

Yes exactly, at first sight it seems that all is OK but the combobox value is not changed and user have to select the new value again. (The combobox is placed on a page of a pageframe.)