private void Deactivate()
 {
     if (InDropDown)
     {
         Remove(dropdownbox);
         dropdownbox.Visible = false;
         SetFocus();
         Invalidate();
         DropDownStateChanged?.Invoke(this, false);
     }
 }
        private void Activate()
        {
            bool activatable = Enabled && Items.Count > 0 && !InDropDown;

            if (activatable)
            {
                dropdownbox.SuspendLayout();
                var p = FindScreenCoords(new Point(0, Height));
                dropdownbox.Bounds                = new Rectangle(p.X, p.Y, Width - ClientLeftMargin - ClientRightMargin, Height);
                dropdownbox.ScaleWindow           = FindScaler();
                dropdownbox.Name                  = Name + "-Dropdown";
                dropdownbox.TopMost               = true;
                dropdownbox.AutoSize              = true;
                dropdownbox.Font                  = Font;
                dropdownbox.Visible               = true;
                dropdownbox.ShowFocusBox          = true;
                dropdownbox.HighlightSelectedItem = true;
                dropdownbox.ResumeLayout();
                AddToDesktop(dropdownbox);             // attach to display, not us, so it shows over everything
                DropDownStateChanged?.Invoke(this, true);
                dropdownbox.SetFocus();
            }
        }