How do you call into a Table Class

[Das Goravani]

To put code that would normally be behind a button on a window say, into a table class, and call it from the window, how do you do that call?

I just tried using the Notation Inspector, dragged over a line containing a new method I made in the table class, and the window doesn’t like that, it beeps and says that the method is not a valid child of the table class (uses other words).  

I can’t figure out ANY way to call a table class method from a window.  Please help.