GtkTree and Selections

[Jose Cascais <cascais label2 ist utl pt>]

	I asked for help several days ago.
	My message did not show up on the list mail neither I had any
answer.
	Here it goes again:

        When selecting (with the mouse) an item in a GtkTree we need to
only execute our callback function without having the item highlighted,
added to the selection_list, or having any other handler or function
executed anyhow.
        We are using GTK_SELECTION_MULTIPLE 

        How can we do it?
 
Blocking handlers or emit_stop's seem do not work....

                                Thank you

                                J. Cascais