I think i am going to start a new topic for the issue... I ran into to the problem that i groups and graphic primitives wouldn't behave as expected when compositions are created, in more detail, when a layout is applied.
I now understand, that compared to Degrapha, there is no possibility to draw into the Group instance directly, but to draw into a child of the component. Which leads to the following: unnecessary nesting from Groups and unnecessary remeasureing. Creating: <Group><Rect height=100% width=100% /><VGroup height=100% width=100%/></Group> Just for a background of the VGroup is not really a clever way performance wise.

