InputFormTextBox not supported in SharePoint 2010 sandboxed solutions

I'm trying to build a sandboxed solution visual webpart that includes a richtext field, the inputformtextbox control, and it looks like the better part of th开发者_StackOverflow中文版e Microsoft.SharePoint.Webcontrols namespace isn't available in sandboxed solution? Is this true? Has anyone come across a workaround for this?

There's a workaround, the Ajax libraries have a Richtext editor.