Why I can't add to FormPanel any gwt widgets like ListBox?
Code:
FormPanel panel = new FormPanel();
panel.frame = true;
panel.fieldWidth = 300;
panel.labelWidth = 200;
panel.buttonAlign = HorizontalAlignment.CENTER;
panel.setHeading(getPageTitle());
panel.setIconStyle("icon-form");
panel.setWidth(600);
panel.setStyleAttribute("padding", "20");
final ListBox lb = new ListBox();
lb.setWidth("200px");
lb.setVisibleItemCount(1);
lb.addItem("item 1 ");
lb.addItem("item 2 ");
lb.addItem("item 3 ");
panel.add(lb);
final TextBox tb = new TextBox();
tb.setText("xxxx");
panel.add(tb);
But form panel is empy.
(I work with Firefox browser)