Use `:error` pseudoclass in TextBox.
Use `:error` pseudoclass in TextBox.

MrDaedra/Avalonia,jkoritzinsky/Avalonia,grokys/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,OronDF343/Avalonia,SuperJMN/Avalonia,SuperJMN/Avalonia,wieslawsoltes/Perspex,Perspex/Perspex,wieslawsoltes/Perspex,jkoritzinsky/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,jazzay/Perspex,jkoritzinsky/Avalonia,jkoritzinsky/Avalonia,Perspex/Perspex,akrisiun/Perspex,susloparovdenis/Avalonia,AvaloniaUI/Avalonia,SuperJMN/Avalonia,susloparovdenis/Perspex,AvaloniaUI/Avalonia,SuperJMN/Avalonia,susloparovdenis/Avalonia,jkoritzinsky/Avalonia,jkoritzinsky/Avalonia,wieslawsoltes/Perspex,wieslawsoltes/Perspex,wieslawsoltes/Perspex,SuperJMN/Avalonia,susloparovdenis/Perspex,jkoritzinsky/Avalonia,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,jkoritzinsky/Avalonia,SuperJMN/Avalonia,OronDF343/Avalonia,wieslawsoltes/Perspex,MrDaedra/Avalonia,SuperJMN/Avalonia,grokys/Perspex