Tags p,em,strong,ul,ol,p,...,???,... are ignored

[niichavo]

Hello!

Miracles have started on pages of site after adding ext:ScriptManager in MasterPage .
Bold headers are not applying in asp:GridView, though HeaderStyle-Font-Bold = "true" has been set in Skin-file (asp-theme) and even on page.
Tags <p><em><strong><ul><ol><p>...???... are not applying too.

For example in GridView:

<asp:TemplateField>
    <ItemTemplate>
        <div id='<%# Eval("Id") %>'>
                    
                                 
        <br />
                                        
            <asp:Label ID="LabelNewsBody" runat="server" Text='<%# Eval("Body") %>'></asp:Label>
        

        ...

Where Text='<%# Eval("Body") %>':

<p>xxx</p>
<ol>
    <li><strong>xxx</strong> xxx</li>
    <li><strong>xxx</strong> xxx</li>    
</ol>
<ul>
    <li><strong>xxx</strong> xxx</li>
    <li><strong>xxx</strong> xxx</li>
</ul>

Result:

xxx
xxx xxx
xxx xxx

[niichavo]

How I have understood, such behaviour is feature ExtJS?

[niichavo]

css class creation step-by-step repair situation. Hmmm, as a verse :)