Bug 145021 Enhance the agrregate on option in column binding dialog
1. Check if the expression is aggregate expression by data utility class. 2. If yes, the option is ?all? and group name list 3. if not, the option disabled (or set to none?) if the column binding is in detail row. If the column binding is in group row, the option is ?None? and group name list.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
bindingTable.setLabelProvider( labelProvider );
		bindingTable.setCellModifier( cellModifier );
		bindingTable.setInput( inputElement );
		bindingTable.addSelectionChangedListener( new ISelectionChangedListener( ) {
			public void selectionChanged( SelectionChangedEvent event )
			{
				
				if ( !bindingTable.getSelection( ).isEmpty( ) )
				{
					Object obj = ( (IStructuredSelection) bindingTable.getSelection( ) ).getFirstElement( );
					if ( obj == dummyChoice && !existHighLightColumn( ) )
					{
						bindingTable.refresh( );
						setHihtLightColumn( );
					}
					else if ( obj instanceof ComputedColumnHandle )
					{
						ComputedColumnHandle column = (ComputedColumnHandle) obj;
						BindingExpressionProvider provider = new BindingExpressionProvider( column.getElementHandle( ) );
						provider.addFilter( new ComputedColumnExpressionFilter( bindingTable ) );
						expressionCellEditor.setExpressionProvider( provider );
					}
				}
			}
		} );
		
		return parentComposite;
	}
	private boolean existHighLightColumn( )
	{