Android Question tabhost Orientation

hello

I have tabhost with 2 tabs 1 portrait and 1 landscape
the landscape with webview
I use phone.SetScreenOrientation(0) in TabHost1_TabChanged
but when i click the tabhost the tab changes back to the original tab
so i added this to manfest - SetActivityAttribute(Graphs,android:configChanges,"keyboardHidden|orientation|screenSize")
but now the tabhost is not redraw
i have tried TabHost1.Invalidate and change the left,right,width,hight
but still the same

tank you