Thank you for your reply concerning the access of body part attributes.
In our application we defined the layout of the windows: all forms should contain a header, a body and a footer. And we defined width and height for them. Instead of setting up these values in each form, I would prefer to initialize these values dynamically. E.g. call a method on load, defined once in a basic module. And whenever we decide to change the layout of our forms, I only had to change the values in one method.
Any other hints are very welcome.
Thanks and regards