Cursor position - Deletion of Text.

[<gtk uk2 net>]

I'm rather new at GRK, and the tutorial is OK but I can't solve two
problems with it:

1 - How do I get the cursor in a particular position: I have a pop up
    window with a form, and the cursor has to be in a particular entry.
    This has to be built in, no keyboard or mouse.

2 - I have a GtkText that has some text in it that I got some way. I
    need to press a button and have the text disappear and the widget be
    ready to receive a new text. All this in the program, no human
    intervention by keyboard or mouse.

Thanks

Henry Gall