private void barButtonItem7_ItemClick(object sender, ItemClickEventArgs e)
{
Grades s = new Grades();
s.ShowDialog();
}
private void navBarItem13_LinkClicked(object sender, DevExpress.XtraNavBar.NavBarLinkEventArgs e)
{
Grades s = new Grades();
s.ShowDialog();
}
private void metroTile1_Click(object sender, EventArgs e)
{
Grades gr = new Grades();
gr.ShowDialog();
}