Maintain pressed button and lossen it

[Ana Gutierrez Pascual <al004180 anubis uji es>]

Hi,
I want to know how can I do:
If I'm a drawing area, with some different objects, lines, rectangles,
points, circles, ... So, I want that when I click inside any object,
create an event that shows the value of the object during I maintain
pressed button, and when I loosen the button the value disappears.
Any idea,
My problem is when if I use a variable GdkFont, it appears when I
clicked in the object, but I can't delete it after it's drawed.
thanks in advance.

ana.