Bug 232048 [Viewers] binary incompatibility (adding public fields) reported against jface.viewers
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
public void removePropertyChangeListener(IPropertyChangeListener listener) {
		propertyChangeListeners.remove(listener);
	}
	/**
	 * Sets or clears the current error message for this cell editor.
	 * <p>
	 * No formatting is done here, the message to be set is expected to be fully
	 * formatted before being passed in.
	 * </p>
	 *
	 * @param message
	 *            the error message, or <code>null</code> to clear
	 */
	protected void setErrorMessage(String message) {
		errorMessage = message;
	}
	/**
	 * Sets the focus to the cell editor's control.
	 */
	public void setFocus() {
		doSetFocus();
	}
	/**
	 * Sets the input validator for this cell editor.
	 *
	 * @param validator
	 *            the input validator, or <code>null</code> if none
	 */
	public void setValidator(ICellEditorValidator validator) {
		this.validator = validator;