Submitting a <form> using either POST or GET results in a refresh of the whole Pageflakes page. As this is inconsistent with the AJAX model that Pageflakes uses, any <form> elements are removed by the Pageflakes framework when the page is being loaded.
Developers should instead make usage of the Content Proxy object to communicate with server-side implementations.
Since the <form> tag is removed, it is not possible to use ASP.NET Controls such as DataGrid, Repeater, Calendar, Validators, etc. However, intrinsic HTML controls are allowed.