InputFormTextbox in WebPart ribbon not changing to rich text mode

Question

I have added an InputFormTextBox to my webpart and made the webpart display for the default new form. I expect the ribbon to change to allow rich text editing when you click into the textbox. But it does not, is there something I'm missing?

            <SharePoint:InputFormTextBox ID="txtRichContent" runat="server" TextMode="MultiLine" Rows="15"
             Columns="90" AllowHyperlink="true" ValidationGroup="Content" RichTextMode="FullHtml" ToolTip="Enter formatted content here, or use the HTML button to edit the HTML directly" Wrap="true"></SharePoint:InputFormTextBox>

Using SharePoint 2010 Foundation.