C# Lookup window to return using Enter/Return

I have a C# lookup window that I wanted to add hitting the Enter/Return key to return the value. As soon as I did that it killed double click. As soon as I move the mouse pointer the lookup window exits.  How do I get this to work so both double-click and Enter return the value?

        private void dgvBatches_DoubleClick(object sender, EventArgs e)
        {
            int currentRow;

            currentRow = dgvBatches.CurrentCell.RowIndex;
            dgvBatches.CurrentCell = dgvBatches[0, currentRow];
            CellValue = dgvBatches.CurrentCell.Value.ToString();

            DialogResult = DialogResult.OK;

            return;
        }

        private void dgvBatches_Enter(object sender, EventArgs e)
        {
            int currentRow;

            currentRow = dgvBatches.CurrentCell.RowIndex;
            dgvBatches.CurrentCell = dgvBatches[0, currentRow];
            CellValue = dgvBatches.CurrentCell.Value.ToString();

            DialogResult = DialogResult.OK;

            return;
        }