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/DialogCellEditor.java
* <p>
 * Subclasses may reimplement.  If you reimplement this method, you
 * should also reimplement <code>updateContents</code>.
 * </p>
 *
 * @param cell the control for this cell editor
 */
protected Control createContents(Composite cell) {
	defaultLabel = new Label(cell, SWT.LEFT);
	defaultLabel.setFont(cell.getFont());
	defaultLabel.setBackground(cell.getBackground());
	return defaultLabel;
}
/* (non-Javadoc)
 * Method declared on CellEditor.
 */
protected Control createControl(Composite parent) {
	Font font = parent.getFont();
	Color bg = parent.getBackground();
	editor = new Composite(parent, SWT.NONE);
	editor.setFont(font);
	editor.setBackground(bg);
	editor.setLayout(new DialogCellLayout());
	contents = createContents(editor);
	updateContents(value);
	
	button = createButton(editor);
	button.setFont(font);
	button.addKeyListener(new KeyAdapter() {
		public void keyReleased(KeyEvent e) {