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
GridData gridData = new GridData( );
					gridData.widthHint = txtFilter.getBounds( ).width - 7;
					txtArg.setLayoutData( gridData );
					createExpressionButton( argsComposite, txtArg );
					argsMap.put( argName, txtArg );
				}
			}
			else
			{
				( (GridData) argsComposite.getLayoutData( ) ).heightHint = 0;
				
			}
			this.cmbDataField.setEnabled( function.needDataField( ) );
			Control control = (Control) cmbDataField.getData( "express" );
			if ( control != null )
				control.setEnabled( function.needDataField( ) );
		}
		else
		{
			( (GridData) argsComposite.getLayoutData( ) ).heightHint = 0;
			
			
		}
		argsComposite.layout( );
		composite.layout( );
	}
	private void createExpressionButton( final Composite parent, final Text text )
	{
		Button expressionButton = new Button( parent, SWT.PUSH );
		if ( expressionProvider == null )