private void tsbtnShowAllRequests_Click(object sender, EventArgs e)
 {
     Form form = new HulpVragen(this, Administration, true);
     form.Show();
     this.Hide();
 }
 private void PlaatsHulpvraag_FormClosed(object sender, FormClosedEventArgs e)
 {
     if (previous is HoofdForm)
     {
         this.previous.Show();
     }
     if (previous is HulpVragen)
     {
         Form form = new HulpVragen(((HulpVragen)previous).previous, Administration, true);
         form.Show();
     }
 }