>>>>>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.
>>>>
>>>>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.)
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>>I think I'm having some other issues with the comboboxes. Sometimes when I quickly try to type some sequence, it looks like the combobox ignores it and just jumps to another item.
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>I do not know if it is an official bug, but maybe you can work around by checking to see if the value of the comboBox is equal to the displayvalue prior to losing focus.

The control does not lost focus after picking an item from the dropdown list. I I will try with another methods - maybe valid or interactive change.
Thanks for the suggestion. The worst is that even if I will be able to detect such improper thing, user still will have to make the whole operation again (click on combo, search for the proper item by scrolling dropdownlist and click on proper item)