panel.refresh();
TableLayoutInfo layout = (TableLayoutInfo) panel.getLayout();
PanelInfo composite = (PanelInfo) panel.getChildrenWidgets().get(0);
WidgetInfo button = composite.getChildrenWidgets().get(0);
//
layout.command_ADD(button, 0, false, 1, false);
assertEditor(
"import com.google.gwt.user.client.ui.Button;",
"public class Test extends Panel {",
" public Test() {",
" setLayout(new TableLayout(1));",