Ext.Net.AccordionDesigner.RemovePanel C# (CSharp) Method

        public void RemovePanel()
        {
            int oldIndex = this.layout.ExpandedPanelIndex;

            if (this.layout.ExpandedPanelIndex > -1)
            {
                IDesignerHost host = (IDesignerHost)GetService(typeof(IDesignerHost));

                if (host != null)
                {
                    using (DesignerTransaction dt = host.CreateTransaction("Remove Panel"))
                    {
                        IComponentChangeService changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
                        PanelBase panel = this.layout.Items[oldIndex] as PanelBase;
                        
                        try
                        {
                            changeService.OnComponentChanging(this.layout, TypeDescriptor.GetProperties(this.layout)["Items"]);
                            this.layout.Items.Remove(panel);

                            if (this.layout.Items.Count > 0)
                            {
                                PanelBase activeItem =
                                    this.layout.Items[Math.Min(oldIndex, this.layout.Items.Count - 1)] as PanelBase;

                                this.ExpandItem(activeItem);
                            }
                        }
                        finally
                        {
                            changeService.OnComponentChanged(this.layout, TypeDescriptor.GetProperties(this.layout)["Items"], null, null);
                        }

                        panel.Dispose();

                        this.UpdateDesignTimeHtml();
                        dt.Commit();
                    }
                    this.Tag.SetDirty(true);
                }
            }
        }