Bugs with ButtonBar in GXT ContentPanel, GXT FramedPanel (gxt-3.0.1)

[unconsionable]

When I put ContentPanel to ContentPanel and ButtonBar contains Buttons I have incorrect position of ui components. FramedPanel has the same behavior.

Example Code for first image:

<container:SimpleContainer ui:field="topContainer" pixelSize="400, 300" borders="true">
            
            <gxt:FramedPanel>
                <gxt:FramedPanel>
                    <gxt:FramedPanel>
                        
                    </gxt:FramedPanel>
                    
                    <gxt:button>
                        <button:TextButton text="1" />
                    </gxt:button>
                </gxt:FramedPanel>
                
                <gxt:button>
                    <button:TextButton text="1" />
                </gxt:button>
                
            </gxt:FramedPanel>
            
        </container:SimpleContainer>

parent(button).child(button).child(empty).jpgparent(button).child(empty).child(button).pngparent(button).child(empty).child(empty).jpgparent(button).child(empty).pngparent(empty).child(button).png