Bug 189806 Add aggregation data item to a table - Exception is thrown
- Add a table with dataset to a report design - DnD aggregation from palette to the table footer - Aggregation builder is shown - Choose SUM function on "Quantity orderred" data field Current behavior - A exception is thrown which say java.util.EmptyStackException
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
return i;
		}
		return -1;
	}
	private void createAggregateSection( Composite composite )
	{
		new Label( composite, SWT.NONE ).setText( FUNCTION );
		cmbFunction = new Combo( composite, SWT.BORDER | SWT.READ_ONLY );
		cmbFunction.setLayoutData( new GridData( GridData.FILL_HORIZONTAL
				| GridData.GRAB_HORIZONTAL ) );
		WidgetUtil.createGridPlaceholder( composite, 1, false );
		cmbFunction.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				handleFunctionSelectEvent( );
			}
		} );
		new Label( composite, SWT.NONE ).setText( DATA_FIELD );
		cmbDataField = new Combo( composite, SWT.BORDER );
		cmbDataField.setLayoutData( new GridData( GridData.FILL_HORIZONTAL
				| GridData.GRAB_HORIZONTAL ) );
		WidgetUtil.createGridPlaceholder( composite, 1, false );
		cmbDataField.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				validate( );
			}
		} );
		cmbDataField.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )