Replaces the item at position index with a text. Removes all combo box items. Does nothing if the combo isn't editable. This is particularly handy when using a combo box as a line edit with history. Reimplemented from QObject.
Handles focus in events.
Reimplemented from QWidget. This signal is emitted when a new item has been highlighted. This signal is emitted when a new item has been set to current. The index is the position of the item in the popup list. Inserts a pixmap item at position index .