private void OnPanelDisposed(object sender, EventArgs e)
        {
            // Unhook from events so the control can be garbage collected
            _panel.Disposed -= OnPanelDisposed;

            // Events are generated from the parent docking manager
            KryptonDockingManager dockingManager = DockingManager;

            if (dockingManager != null)
            {
                // Only generate the removed event if we have already fired the adding event.
                if (_panelEventFired)
                {
                    AutoHiddenGroupPanelEventArgs panelArgs = new(_panel, this);
                    dockingManager.RaiseAutoHiddenGroupPanelRemoved(panelArgs);
                }
            }

            // Make sure the sliding panel is also disposed
            if (!_slidePanel.IsDisposed)
            {
                _slidePanel.Dispose();
            }
        }