AcrylicMessageBox Issues

[fhnb16]

I have two issues with messageboxes:

1. If i show AcrylicMessageBox with text "first" and then show another messagebox with text "second" - i always see text "first".
   First messagebox called from first window (owner), second called from another window.
2. Caption not showing on First Messagebox (If MessageBoxButton.OK not defined).
   
   v0.10.2

[fhnb16]

#124 (Jul 25) Sorry for duplicate, but problem still actual..