Bug 191089 cross tab Binding tab- Aggregate On field is shows incorrect field name
Cross tab-Binding under properties hows incorrect field for 'Aggregate On'. It show show similar to regular table binding 'Aggregate On' field. For example; instead of Location/country it should show either 'N/A' for table or 'Group Country' for any group.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
* @return the iterator of binding columns
	 */
	public static Iterator getBindingColumnIterator( DesignElementHandle handle )
	{
		if ( handle instanceof ReportItemHandle )
		{
			return ( (ReportItemHandle) handle ).columnBindingsIterator( );
		}
		return Collections.EMPTY_LIST.iterator( );
	}
	/**
	 * Return the expression for the given binding column based on the given
	 * element
	 * 
	 * @param baseElement
	 *            the base element
	 * @param column
	 *            the binding column
	 * @return the expression for the column
	 */
	public static String getBindingexpression( DesignElementHandle baseElement,
			ComputedColumnHandle column )
	{
		String exp = IReportElementConstants.BINDING_COLUMN_PREFIX;
		if ( isCrosstabElement( baseElement ) )
		{
			exp = ExpressionUtil.DATA_INDICATOR;
		}
		for ( int i = 0; i < getBindingLevel( column.getElementHandle( ),
				baseElement ); i++ )