Hm. May I offer another suggestion that doesn't rely on a bug _not_ being fixed or a "fake-out"? (or, I may just not be reading the question the same way you intend it *shrug*)

You could subclass a combobox,
add a custom property called times_clicked (or whatever)
increment Times_clicked in the Click()
If it's the first time, do what you have to do,
If it's the second time, DODEFAULT() and reset the times_clicked to 0.


>>Is it possible to implement the following ? First click on a combobox in a grid only sets up a current cell and the second click on the same cell shows the list of values.
...snip