When you run a form that has a graph and you double click on the graph, the control is activated and a menu appears to modify the graph. One of the options in the menu is a By Column button, that changes the bars on the graph purple. How can I do this programatically?

Go to my website and download the white paper and code samples from my "Creating Graphs In VFP" conference session. It should give you everything you need to create and manipulate graphs.