I am having a problem after I bind a Infragistics windows grid to a MM bizobj. My bound controls are not refreshing.

I removed the infragistics windows grid and replaced it with a mmDataGrid, and my controls refresh properly. I really have a couple of questions:

1) How come the controls are not refreshing?

2) In general, how do you navigate in a business object? For instance, I want to have a grid that displays data but i not contained in a MM business object. When the user navigates in the grid, I want to move the business object's position in its datatable and refresh the bound controls. How can I do this?