WComboBox, WSelectionBox and
Ext::ComboBox can either be filled by traditional
insertItem() calls, or by making a reference to a
model. The three examples below are three views on the same
model. With the Ext combobox, you can modify the model. Type a
new item in the text field of the combobox, press the button,
and watch how the new item also becomes available in the
WComboBox and the WSelectionBox without
writing a single line of code.