Insert row at selected row in datagridview

Hi, I am trying to add a row at the selected row but it keeps adding it to the end.  I can't seem to figure it out, below is my code (some of it is custom code).  I tried to modify last line 'fillgridrow' but can't figure out how to insert row at the index selected.

private void button1_Click(object sender, EventArgs e)
        {
            DataGridViewRow dgr = dataGridView1.Rows[dataGridView1.CurrentRow.Index];
            DataRow dr = itemsDT.Rows[(int)dgr.Cells["idx"].Value];

            hiseq++;
            AddRepeatItem(dr); //update sql query
            GetNewItem();  //select new item sql query

            if (newitemDT.Rows.Count == 0)
            {
                MessageBox.Show("Error writing repeat item entry. Call Systems. ");
            }
            DataRow dr2 = newitemDT.Rows[0];
            //itemsDT.Rows.Add(dr2);
            itemsDT.ImportRow(dr2);
            FillGridRow(dr2, newitemDT.Rows.Count - 1);  
        }