Calling toolstripbutton from MDI child form

// we expose the DataGridView by creating a public Property
public DataGridView f1DGView { get; set; }

private void MdiChildForm1_Load(object sender, EventArgs e)
{
    f1DGView = dataGridView1;
}

// to keep track of the current Row
// when the DataGridView on either MdiCHildForm gets a double-click
int currentDGVRow;

// create instances of the MdiChildForms
private MdiChildForm1 = new MdiChildForm1();
private MdiChildForm2 = new MdiChildForm2();

private void MdiParent_Load(object sender, EventArgs e)
{
    MdiChildForm1.MdiParent = this;
    MdiChildForm2.MdiParent = this;
    //
    // both MdiChild Forms must be shown once to allow access to
    // their internal DataGridView Control
    MdiChildForm1.Show();
    MdiChildForm2.Show();
    MdiChildForm2.Hide();
    //
    // handle the CellDoubleClick Event on both ChildMdiForms
    MdiChildForm1.f1DGView.CellDoubleClick += f1DGView_CellDoubleClick;
    MdiChildForm2.f2DGView.CellDoubleClick += f2DGView_CellDoubleClick;
    //
}

private void f1DGView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    // get the row where the double-click occurred
    currentDGVRow = e.RowIndex;

    // set the ToolStrip buttons background color
    button1.BackColor = Color.Ivory;
    button2.BackColor = Color.Snow;

    // hide the current MdiChildForm and show the other MdiChildForm
    MdiChildForm1.Hide();
    MdiChildForm2.Show();

    // select the same row in the other MdiChildForm which is now visible
    MdiChildForm2.f2DGView.Rows[currentDGVRow].Selected = true;
}

private void f2DGView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
    currentDGVRow = e.RowIndex;

    button1.BackColor = Color.Snow;
    button2.BackColor = Color.Ivory;

    MdiChildForm2.Hide();
    MdiChildForm1.Show();

    MdiChildForm1.f1DGView.Rows[currentDGVRow].Selected = true;
}