Zooming with Focus on Track View, PRV and Staff View

Hi:)
 
3 Windows, Track View, PRV and Staff View
 
I'm starting with the Focus in Track View:
Ctrl+Up, Down, Left and Right work as expected
 
I switch the Focus with  Ctrl+TAB to PRV
Ctrl+Up, Down, Left and Right are working still in Track view Window, not in PRV window, I have to click in the window for the keys to work in PRV
 
I switch the Focus with Ctrl+TAB to Staff View
Ctrl+Up, down work as expected
 
I switch Focus back to Track View
Ctrl Up and Down work as expected
Ctrl Left and Right are now hte same as Ctrl+PgDn, PgUp
 
Is this only my behaviour??
I did not realize, since when this doesn't work......
 
Could someone please confirm??
 
Thanks;)
Bassman.