I added now the SkinProvider component on every form that is present in the Project and linked it with the SkinManager of the Main Form.
It reacts very well. I don' t even Change any of the properties of the forms. Just insert the component in the form.
When I change the Skin or the scale mode in the main form, all other forms are set accordingly, without writing extra Code.
Many thanks for the Support!
Best Regards,
Francesco