Tkinter question: position cursor within text widget

[v.wehren]

I have a small Tkinter question:

After loading the contens of a text file into a text widget with something
like: <snip>
     content = inf.read()
     self.textbox.insert(END, content)
     self.textbox.focus_set()
      </snip>

I want the insert cursor to be at the home position after the file has
loaded.Is there a simple method to position the cursor at a given index? I
haven't *found* any in the "prevailing" Tkinter sources across the web
yet...

Anybody?

Thanx!
Vincent Wehren