Cleaned up key window accessors
Cleaned up key window accessors

revile/TWMessageBarManager,xueqiu/TWMessageBarManager,zuojx1013/TWMessageBarManager,primoz990/TWMessageBarManager,CharlyInc/TWMessageBarManager,hbucius/TWMessageBarManager,bobqian1130/TWMessageBarManager,cooksimo/TWMessageBarManager,ben181231/TWMessageBarManager,terryworona/TWMessageBarManager,VojtaStavik/TWMessageBarManager,howeguo/TWMessageBarManager,AlexanderMazaletskiy/TWMessageBarManager