CB_GETEXTENDEDUI

wParam = 0; /* not used, must be zero */

lParam = 0; /* not used, must be zero */

An application sends a CB_GETEXTENDEDUI message to determine whether a combo box has the default user interface or the extended user interface.

This message has no parameters.

The return value is one if the combo box has the extended user interface or zero if it does not.

The extended user interface differs from the default user interface in the following ways:

Clicking the static text field displays the list box (CBS_DROPDOWNLIST style only).

Pressing DOWN displays the list box (F4 is disabled).

Scrolling in the static text field is disabled when the item list is not visible (the direction keys are disabled).