I'm creating a ComboBox using the following code:

Code:
ComboBox combo = new ComboBox<BeanModel>();
combo.setFieldLabel("Some Combo");
combo.setEmptyText("Select a value");
combo.setTypeAhead(true);
combo.setTriggerAction(TriggerAction.ALL);
combo.setDisplayField("name");
combo.setReadOnly(true);

ListStore<BeanModel> store = new ListStore<BeanModel>();
store.setSortField("name");
store.setStoreSorter(new StoreSorter<D>());
combo.setStore(store);

// Fill the ComboBox with some values
Now because I've set the readonly flag to true I cannot click de drop down arrow and change the selected value of the ComboBox. So far so good. But if I put the mouse's cursor in the ComboBox, press the backspace key once and wait a few seconds, the ComboBox shows me all of its values and I can even select another value.

I think its a bug.
Could I be mistaken?

Besides this problem, have you considered not showing the drop down arrow of the ComboBox when its readonly? Same with the date picker on the DateField?