right, now i am close to where i was, when i was still inheriting from QVBoxLayout: no crash, but nothing to see as well. these are the messages i get on the console:
Qt Code: 
  1. settin  "02.10" "Bauwerke in der Kanalisation" // see the code posted above
  2. no Items found in gbl    // in the Designer i had added an empty layout for gbl
  3. Attempting to add QLayout "" to ConfigWindow "ConfigWindow", which already has a layout.  // i don't have any idea where this message comes from.
  4. // please see the code above - i am not yet adding a layout
  5. // and i never add it to ConfigWindow
  6.  
  7. // the next two messages are from aart.getEigenschaftenEdit(this), this is why i think the error above is coming too early. i get told, that 2 elemens have been successfully added to the layout, so i should be able to see something
  8. es werden bereits  0  Atribute verwendet. Weiter  2  k÷nnen hinzugewõhlt werden
  9. Das Eigenschaftenlayout hat jetzt  2  Elemente
  10.  
  11. // now a second call to the function
  12. settin  "02.10.60" "Verbindungsbauwerk"
  13. removing Layout "" // this means that obviously i have been able to add a layout at the first try. so why can't i see anything??
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