Can anybody please help me with this? I've got a dialog containing 2 combo boxes. I can fill those boxes in without a problem (using AddString in the InitDialog function), but when I run the application, the ListBox portion of the combo box never shows when I push the down arrow. Instead, I get a thick, black line under the text box. What have I done wrong? I've got nothing in the code except for AddItem calls to populate the combobox. Thanks in advance.