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An iframe's vertical scrollbar does not work when the target is a SharePoint page
<html>
<body>
    <form>
        <div>
            <IFRAME height="300" width="1000" name="MyFrame" scrolling="yes"
                    src="http://mycompany.com/mysilverlightpage.aspx">
            </IFRAME>
        </div>
    </form>
</body>
</html>

<div ID="s4-workspace" class="s4-nosetwidth">
   <div ID="s4-bodyContainer">
      <asp:ContentPlaceHolder id="PlaceHolderMain" runat="server"/>
   </div>
</div>