thread process can not change text buffer

[tissatussa]

@Araq : you state "I can confirm that owlkette's threading examples are 
terrible.." \- well, all of their widget examples compile and run fine, they 
give me great insight of Owlkettle workings .. my threading code can be used to 
change other properties, only their Text View widget has this problem - eg. 
changing a simple button label text can be done by the thread. Deducing the 
problem this way, can't we conclude Nim is a cause ?