Using the FGlobalTabmanager, a tab is created and a OnSpawnPluginTab function generates the widgets, and returns a SDockTab. After they are spawned they cannot be changed using SetText() or else. The SDockTab cannot be referenced as unreal engine will not build (TSharedRef sdock;).
I have already programmed a function to save the widget states.
Now I am trying to find out how to restore previous parameters in the text fields but I now wonder if this is even possible at all.