Mouse click not working on ListGrid

I have a strange problem and i am sure it is just simple mistake of
some kind but i cant really find it and i dont really know what to
search.
I create a new window with VerticalPanel in it. Inside this Vertical
Panel i put TabSet with SelectItem component. The problem is that
clicking on drop down is not working. Same situation is when i put
ListGrid inside, RecordClickHandler and RecordDoubleClickHandler are
not working at all (but RowContextClickHandler works).

public class Sample implements EntryPoint {
public void onModuleLoad() {
//Without verticalPanel - works !
SelectItem s1 = new SelectItem();
s1.setTitle("Test List");
s1.setMultiple(true);
s1.setMultipleAppearance(MultipleAppearance.PICKLIST);
s1.setValueMap("a", "b", "c");
DynamicForm c1 = new DynamicForm();
c1.setItems(s1);
TabSet topTabSet = new TabSet();
topTabSet.setTabBarPosition(Side.TOP);
topTabSet.setWidth(800);
topTabSet.setHeight(150);
Tab t1 = new Tab("Tab1");
Tab t2 = new Tab("Tab2");
t2.setPane(c1);
topTabSet.addTab(t1);
topTabSet.addTab(t2);
Window window2 = new Window();
window2.setAutoSize(true);
window2.setTitle("Without VerticalPanel");
window2.setWidth(640);
window2.setHeight(480);
window2.setCanDragReposition(true);
window2.setCanDragResize(true);
window2.addItem(topTabSet);
window2.show();
//With verticalPanel - not working !
SelectItem s2 = new SelectItem();
s2.setTitle("XXX");
s2.setMultiple(true);
s2.setMultipleAppearance(MultipleAppearance.PICKLIST);
s2.setValueMap("d", "e", "f");
DynamicForm c2 = new DynamicForm();
c2.setItems(s2);
TabSet topTabSet2 = new TabSet();
topTabSet2.setTabBarPosition(Side.TOP);
topTabSet2.setWidth(800);
topTabSet2.setHeight(150);
Tab t11 = new Tab("Tab1");
Tab t22 = new Tab("Tab2");
t22.setPane(c2);
topTabSet2.addTab(t11);
topTabSet2.addTab(t22);
VerticalPanel vp = new VerticalPanel();
vp.add(topTabSet2);
Window window = new Window();
window.setAutoSize(true);
window.setTitle("With VerticalPanel");
window.setWidth(640);
window.setHeight(480);
window.centerInPage();
window.setCanDragReposition(true);
window.setCanDragResize(true);
window.addItem(vp);
window.show();
}
}

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