I found a person recommends Visual WebGui in http://www.planetsourcecode.com. I visited http://www.visualwebgui.com for more info about it. From my understanding, Visual WebGui uses WinForm and AJAX technologies. I saw one demo in http://www.visualwebgui.com/Default.aspx?tabid=118. The form looks more UI rich compare to normal web application. Is it possible to run Visual WebGui on StrataFrame?

Yes, you can combine any 3rd party user interface controls with StrataFrame by simply implementing the IWebBusinessBindable (or IBusinessBindable on the WinForms side) interface within inherited controls.  The simplest way to implement the control would be to copy the source code from a StrataFrame user interface control and modify it to meet your needs.  I believe the IWebBusinessBindable interface has around 8 properties and a few of them require attributes to reference the type editors and type converters used within the framework.