private void del_Click(System.Object sender, EventArgs e)
        {
            (parent as project_form).hold_autosize(this);
            Label          tmplbl = (Label)sender;
            SplitContainer SC     = (SplitContainer)tmplbl.Parent.Parent;

            verwijderd += 1;
            for (int i = 0; i < num_rows; i++)
            {
                if (SC == SC_ar[i])
                {
                    delnrs.Push(i);
                    SC.Hide();
                    to_del[i] = true;
                    //collaps(i);
                    //btn_add.Location = new System.Drawing.Point(btn_add.Location.X, btn_add.Location.Y-33);
                }
            }
        }