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/TextCellEditor.java
*/
public void performCopy() {
	text.copy();
}
/**
 * The <code>TextCellEditor</code> implementation of this
 * <code>CellEditor</code> method cuts the
 * current selection to the clipboard. 
 */
public void performCut() {
	text.cut();
	checkSelection(); 
	checkDeleteable();
	checkSelectable();
}
/**
 * The <code>TextCellEditor</code> implementation of this
 * <code>CellEditor</code> method deletes the
 * current selection or, if there is no selection,
 * the character next character from the current position. 
 */
public void performDelete() {
	if (text.getSelectionCount() > 0)
		
		text.insert(""); 
	else {
		
		int pos = text.getCaretPosition();
		if (pos < text.getCharCount()) {
			text.setSelection(pos, pos + 1);