Tab sequence

I notice a strange behaviour of the tab sequence in our framework.
It is an older version of the framework we build together with Sanneke.

On a form outside the framework I can cycle trough the fields using the tab key.
After the last field it will go to the first field, so it cycles as expected.

But in all forms inside the framework when the cursor leaves the last field it does not
go to the first field, but it dissapears. No matter how often I keep tabbing, it does not reappear.

Anyone seen this behaviour ?
It is on Servoy 5.2.10 , windows7

Regards,

Focus may go into a child container. Can you find the focus in one of those?
You can also try using CTRL+TAB or CTRL+SHIFT+TAB, see if that makes the focus reappear.