Need to update combo box when add, modify, or delete records to db.

I have a combo box that is bound to a table in a dataset.  When I add, modify or delete a record in the  dataset, i need that to be reflected in the combo box.  I use the generated functions of the dataset.  The database itself changes accordingly but not the bound control.  I am using Visual C++ in VS 2005.  All the databinding was done with drag and drop in the visual designer.

Thanks in advance for your help