Changing Windows Themes >in the background<

[newhere]

Hey,

Im completely new to AutoIt and therefore am completely clueless what to do or understanding topics with similar problems.

Ive got the following script:

RunWait(@ComSpec & " /c " & '%SystemRoot%system32rundll32.exe %SystemRoot%system32shell32.dll,Control_RunDLL %SystemRoot%system32desk.cpl desk,@Themes /Action:OpenTheme /file:"C:UsersUsernameAppDataLocalMicrosoftWindowsThemesDay.theme"', "", @SW_HIDE)
WinWait("Anpassung")
WinClose("Anpassung")

Where "Anpassung" is the Windows 7 Personalization Window where you change/create themes (I dont know the exact name in the english version of Windows). This combined with the task schedule function of windows 7 changes my themes according to daytime.

It works perfectly except for one thing that is bugging me:

It opens the Personalization window for a short moment, even when Im doing something in another application (browsing, playing a game and so on).

My question: Is it somehow possible to change the script so it opens the window and closes in the background?