avenue, live link and refresh a viewframe in a layout

please help me, I'm desperately seeking a solution to create a button in a layout in order to toggle live link and the refresh the viewframe; the following code apparently does correctly the toggling of the live link but there is no way to make it refreshing the view;
any hint much appreciated!


'''' start of code

theLayout = av.GetActiveDoc

lstGraphics = theLayout.GetGraphics

vFrame = lstGraphics.FindByClass(ViewFrame)

if(vFrame = Nil) then
MsgBox.Warning("no viewframe in the layout, exiting!","")
exit
end


theView = vFrame.GetView
msgbox.info(theview.asstring,"")

llink= vFrame.isLiveLinked
msgbox.info(llink.asstring,"")


if (llink = true) then

vFrame.SetView(theView, false)
vFrame.SetDisplay(theLayout.GetDisplay)
vFrame.Invalidate
aV.ProcessAllInvals

else

vFrame.SetView(theView, true)
vFrame.SetDisplay(theLayout.GetDisplay)
vFrame.Invalidate
aV.ProcessAllInvals

end
''''''' end of code