How do I add row data directly to a DataGrid Class?

I am using a free opensource class from a company that I will not name (even if it is RadiantQ) that I like a lot. It has this cool MuttiColumnTreeList control that is a combination of a tree control and a datagrid. It comes with an example code that you can look at and everything. It is pretty cool. It is inherited from the DataGrid class.

The problem is that I am kind of new to databinding on this level and so I would like to just go ahead and write some code that forces the data that I have gathered from another class into the control.

So I looked online for how to do that for a DataGrid class and the information is not easily available. Can anyone help?