onload method stops loading tabpanel

I have form (A) with a relationless tab that loads a form (B) with a relationless tab that loads a form (C).
Now on form B I have an onload method that sets a value list.
That’s all what the method does.

When I load form B directly then form C gets loaded fine.
When I load form A then form B is loaded but form C is not loaded.
When I switch to another tab in form A and back then form C loads fine.

When I comment out the application.setValueListItems line then form C is loaded fine the first time.
Also when I use any other code BUT the application.setValueListItems then form C loads fine the first time.

Servoy Developer
Version R2 2.2rc6-build 324
Java version 1.4.2-38 (Mac OS X 10.3.9)

Same result with Servoy Client under Windows XP Prof. (SP2) Java 1.5