GtkEntry

First, Thanks for all the help thus far! I have a GtkEntry in a frame, in a box, in a window When I create the entry, I can set the text to it immediately. But I would like to be able to use a select-row on a clist, that is in the same box, and put the information selected into the Entry. The problem is, when I call the function, and use set_text it keeps telling me I need 3 arguments. If I set this to use 3 arguments, it changes a value in my clist, correspoding to the row, column, string arguments I give. Any/All ideas or comments welcome and appreciated