Ensure sender of correct type in AddClassHandler.
Ensure sender of correct type in AddClassHandler.

Perspex/Perspex,jkoritzinsky/Perspex,MrDaedra/Avalonia,DavidKarlas/Perspex,jkoritzinsky/Avalonia,MrDaedra/Avalonia,bbqchickenrobot/Perspex,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,OronDF343/Avalonia,susloparovdenis/Avalonia,jkoritzinsky/Avalonia,AvaloniaUI/Avalonia,OronDF343/Avalonia,grokys/Perspex,susloparovdenis/Perspex,jkoritzinsky/Avalonia,SuperJMN/Avalonia,jazzay/Perspex,akrisiun/Perspex,danwalmsley/Perspex,wieslawsoltes/Perspex,wieslawsoltes/Perspex,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,wieslawsoltes/Perspex,tshcherban/Perspex,SuperJMN/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,Perspex/Perspex,susloparovdenis/Perspex,punker76/Perspex,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,kekekeks/Perspex,SuperJMN/Avalonia,wieslawsoltes/Perspex,jkoritzinsky/Avalonia,susloparovdenis/Avalonia,wieslawsoltes/Perspex,grokys/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,kekekeks/Perspex,SuperJMN/Avalonia,wieslawsoltes/Perspex,jkoritzinsky/Avalonia