Bug 202398 Aggregaton for List can not aggregate on group [0001]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
{
				if ( DATA_TYPE_CHOICES[i].getDisplayName( )
						.equals( cmbType.getText( ) ) )
				{
					binding.setDataType( DATA_TYPE_CHOICES[i].getName( ) );
					break;
				}
			}
			binding.setExpression( cmbDataField.getText( ) );
			binding.setAggregateFunction( getFunctionByDisplayName( cmbFunction.getText( ) ).getName( ) );
			binding.setFilterExpression( txtFilter.getText( ) );
			if ( btnTable.getSelection( ) )
			{
				binding.setAggregateOn( null );
			}
			else
			{
				binding.setAggregateOn( cmbGroup.getText( ) );
			}
			binding.clearArgumentList( );
			for ( Iterator iterator = argsMap.keySet( ).iterator( ); iterator.hasNext( ); )
			{
				String arg = (String) iterator.next( );
				AggregationArgument argHandle = StructureFactory.createAggregationArgument( );
				argHandle.setName( getArgumentByDisplayName( this.binding.getAggregateFunction( ),
						arg ) );
				argHandle.setValue( ( (Text) argsMap.get( arg ) ).getText( ) );
				binding.addArgument( argHandle );
			}
		}