Ok , i'll add in the options menu the sensivity tab so can be changed , thanks.
I've added this Sub , and i call then ForceImmersiveMode when needed.
Sub ForceImmersiveMode
Dim r As Reflector
r.Target = r.GetActivity
r.Target = r.RunMethod("getWindow")
r.Target = r.RunMethod("getDecorView")
r.RunMethod2("setSystemUiVisibility", 5894, "java.lang.int")
End Sub