FillToolItem is not working

[smitty]

I am using GXT 2.2.5

My problem is, that a FillToolItem does not push the elements, which are added afterwards, to the right.

Here some example code:

public class HeaderPanel extends ToolBar
{
  public HeaderPanel()
  {
    this.add(new ContentPanel());
    this.add(new FillToolItem());
    this.add(new ContentPanel());
  }
}

Result should be:
[ContentPanel][ Space ][ContentPanel]

but is:
[ContentPanel][ContentPanel]


I hope somebody can help me with this problem.

Thanks in advance