Bug 136074 Filter editor needs to support column binding
In the Fitler tab of property editor for table/chart, Expression only shows dataset column, rather than column binding. Since column binding is supported for filter of table/chart, this is supposed to show the column binding.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/views/attributes/providers/SortingModelProvider.java
* 
	 * @param item
	 *            DesignElement object
	 * @param oldPos
	 *            The item's current position
	 * @param newPos
	 *            The item's new position
	 * @return True if success, otherwise false.
	 * @throws PropertyValueException
	 */
	public boolean moveItem( Object item, int oldPos, int newPos )
			throws PropertyValueException
	{
		DesignElementHandle element = (DesignElementHandle) item;
		PropertyHandle propertyHandle = element.getPropertyHandle( ListingHandle.SORT_PROP );
		propertyHandle.moveItem( oldPos, newPos );
		return true;
	}
	/**
	 * Deletes an item.
	 * 
	 * @param item
	 *            DesignElement object
	 * @param pos
	 *            The item's current position
	 * @return True if success, otherwise false.
	 * @throws PropertyValueException
	 */
	public boolean deleteItem( Object item, int pos )
			throws PropertyValueException