private void replaceToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FindBox tab = new FindBox(this);
     tab.FindTabControl.SelectedTab = tab.replaceTabPage;
     tab.Show();
 }
 private void findToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FindBox tab = new FindBox(this);
     tab.Show();
 }