Web Designer - Treeband question (8.0.1)

Hello Experts

I am using a treeband control to show a heirarchical tree structure of products where the user can select one or more products.

In order to show a name and description, I put a girdband in the controllist of the treeband, however when I expand the treeband I get the following error in a popup

An error has occurred.

SyntaxError: Invalid character

It all works fine if I just use labels to display the properties, but as soon as I put a gridband (or even a layoutpanel), I get this error.

Any suggestions?

Thanks

Kin