Edit cell on double click?

["Ian Liu" <ian liu88 gmail com>]

Hi list,

I'm new here and learning GTK, so I have a lot of questions.
Here goes one:

How can I make a cell editable when I double click it?
I set the renderer property "editable" to True on the "row-activated"
signal, but that doesn't worked, since I had to click a third time
to start editing the it.

Thanks,
Ian L.