TToolbar docking problem

In my form I have a TToolbar component attached to a TCoolbar component.
Undocking and docking the Toolbar works fine the first time. Then it is not
possible to do undock the Toolbar a second time. Is this a known bug in
Delphi 5 or has anybody else experienced the same problem?

Ole Willy Tuv

New to Delphi
Currently in the evaluation process of the Delphi 5 trial software