Update released.

DroppedDown property improved in the CommandButtonW control to raise the DropDown event when set to True.

Basically prior to this update the DroppedDown property was kind of useless because it just used BCM_SETDROPDOWNSTATE which does not raise BCN_DROPDOWN.

Now it raises the event properly and ensure the button is redrawn before and after the event. Also it checks for BST_DROPDOWNPUSHED to not allow recursive entry.
The property makes nothing when BS_SPLITBUTTON is not defined.