控件设计时的属性页定位办法

控件设计时的属性页定位办法：
取得IHtmlDocument3 就随心所欲了。

public LabelComponentEditorForm(ComponentEditorLabel designComponent)
        {
            this.designComponent = designComponent;
            
            int innerLeft = Convert.ToInt32(designComponent.Style["clientX"]);
            int innerTop = Convert.ToInt32(designComponent.Style["clientY"]);

            IDesignerHost host = (IDesignerHost) designComponent.Site.GetService(typeof (IDesignerHost));
            ControlDesigner labelDesigner = (ControlDesigner) host.GetDesigner(designComponent);
            object parent = labelDesigner.Behavior.GetAttribute("document", false);
            IHTMLDocument2 doc = (IHTMLDocument2) parent;
            mshtml.IHTMLWindow3 window = (IHTMLWindow3) doc.parentWindow;
            int screenLeft = window.screenLeft;
            int screenTop = window.screenTop;
            
            this.Location = new Point(screenLeft + innerLeft, screenTop + innerTop);

            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

效果如下：