final int row,
final SingleFieldConstraint constraint,
final int col,
HorizontalPanel ebContainer ) {
ExpressionBuilder eb = (ExpressionBuilder) ebContainer.getWidget( 0 );
eb.addExpressionTypeChangeHandler( new ExpressionTypeChangeHandler() {
public void onExpressionTypeChanged( ExpressionTypeChangeEvent event ) {
try {
//Change "operator" drop-down as the content depends on data-type
constraint.setFieldType( event.getNewType() );