GuiComboBoxCtrl?
 

What is the name of the combo box control? Usually they're called combo boxues or select boxes, however I cant see either of these listed in the wiki.

GuiPopUpMenuCtrl

Thanks. I saw that and assumend it to be a right click menu. How come even afer setting the profile to GuiBluePopupMenuProfile the actual popup bit is still red?

There is GuiPopUpMenuCtrl and GuiPopUpEditCtrl for combo boxes, and GuiContextMenuCtrl for the normal right-click menus.
The GuiPopUpMenuCtrl is using a GuiScrollCtrl and GuiTextListCtrl for displaying the menu, to make it possible to custimize everything we have made it possible to set separate profiles for those by using the variables "textprofile" and "scrollprofile".

Thanks. I set scrollprofile to "GuiBlueScrollProfile" but when you mouse over it's still red, and when you select an item it has a red background. Does each individual item need a profile?