I just found *a* solution to my own posted question.  It was so simple, I
thought I'd share it in case anyone else would like to know.

I added a constructor to my frmB which expects a reference to the
dataGridView.  When frmA creates and shows frmB, it passes the reference in
the constructor. The reference is then assigned to a privately declared
dataGridView IN frmB.  Here's code snippets:

frmA -----------------------------------------
       private void configureMenuItem_Click(object sender, EventArgs e)
       {
           frmB frm = new frmB(dgvItems);
           frm.ShowDialog();
       }

frmB ------------------------------------------
   public partial class frmB : Form
   {
       DataGridView dgvItems;

       //Default Constructor -- no longer neeeded; I will delete it
       public frmB()
       {
           InitializeComponent();
       }

       //Custom Constructor
       public frmB(DataGridView dgvItems)
       {
           this.dgvItems = dgvItems;
           InitializeComponent();
       }

Phil