>I generate and format the columns of a grid based on a DBF. Now i want to add some code into de Click event of each header. How can I do that programmaticaly if the methods are read only when the form is runing?

Francisco,
You could have your header class defined in a prg and replace the original ones with them (for sampling check MultiselectGrid class in files\classes section and also near past threads about removing column).
Cetin