1) Start with new Forms application.

2) Add RadDock set to Fill to the Form.

3) Open Designer.

4) Add ToolWindows docked Top and Right.  Add two ToolWindows docked fill.

5) Close Designer.

6) Open Designer.

7) Delete two docked ToolWindows.

8) Close Designer.

9) Deleted ToolWindows remain.  I also had them become tabbed with the 
ToolWindow docked to the Top in a previous test.

10) In the Designer, if I check the box, the two ToolWindows become docked
Left.  If I close the Designer and re-open it, I can then delete them.

11) I deleted all ToolWindows in the Designer and closed it.

12) The ToolWindows are removed.

13) Upon re-opening the Designer and adding windows, they do not appear
upon closing the Designer.

14) It appears that the documentContainer is missing from the DocumentOutline.
However, it is still present in the code because if I delete the RadDock, and
then re-add it, the name of the new documentContainer is numbered higher than
the first one.  If I try to rename it from 1 to 3, it tells me that 1 is still
in use.

15) Adding ToolWindows at this point works again.