private void roosterToolStripMenuItem_Click(object sender, EventArgs e)
{
panel1.Controls.Clear();
groupBox1.Text = "Timetable";
Control[] controls = SomerenUI.showTimetable();
panel1.Controls.AddRange(controls);
// The third control is the button. We want to reload everything after
// saving so we just attach this menu item's click handler to the button
// as well
controls[3].Click += roosterToolStripMenuItem_Click;
}