container.add( new Label( expressionPart.getName() ) );
container.add( new Label( "(" ) );
final ExpressionMethod em = (ExpressionMethod) expressionPart;
final List<ExpressionFormLine> emParams = em.getOrderedParams();
for ( int index = 0; index < emParams.size(); index++ ) {
final ExpressionFormLine paramValueHolder = emParams.get( index );
final String paramDataType = em.getParameterDataType( paramValueHolder );
final ExpressionMethodParameter paramValue = ( (ExpressionMethodParameter) paramValueHolder.getRootExpression() );
final TextBox paramValueEditor = TextBoxFactory.getTextBox( paramDataType );
paramValueEditor.addValueChangeHandler( new ValueChangeHandler<String>() {
@Override
public void onValueChange( ValueChangeEvent<String> event ) {
paramValue.setText( event.getValue() );