Bug 12329 [Cell Editors] Request:ComboBoxCellEditor READ_ONLY style
Although CCombo accepts SWT.READ_ONLY style, there is no way to specify style when it is used in ComboBoxCellEditor. How about adding createControl(Composite parent, int style) method to ComboBoxCellEditor class?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
*/
protected void fireEditorValueChanged(boolean oldValidState, boolean newValidState) {
	Object[] listeners = this.listeners.getListeners();
	for (int i = 0; i < listeners.length; ++i) {
		((ICellEditorListener) listeners[i]).editorValueChanged(oldValidState, newValidState);
	}
}
/**
 * Notifies all registered property listeners
 * of an enablement change.
 *
 * @param actionId the id indicating what action's enablement has changed.
 */
protected void fireEnablementChanged(String actionId) {
	Object[] listeners = propertyChangeListeners.getListeners();
	for (int i = 0; i < listeners.length; ++i) {
		((IPropertyChangeListener) listeners[i]).propertyChange(new PropertyChangeEvent(this, actionId, null, null));
	}
}
/**
 * Returns the control used to implement this cell editor.
 *
 * @return the control, or <code>null</code> if this cell editor has no control
 */
public Control getControl() {
	return control;
}
/**
 * Returns the current error message for this cell editor.
 *