XhtmlTextWriter writes table and attributes problem

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Hi all,
I am building a Composite control, and I need to render Xhtml content for my
control. Here is my sample code:

protected override void Render(HtmlTextWriter output) {
XhtmlTextWriter xWriter = new XhtmlTextWriter(output);

xWriter.AddAttribute(HtmlTextWriterAttribute.Cellp adding, "0");
xWriter.AddAttribute(HtmlTextWriterAttribute.Cells pacing, "0");
xWriter.RenderBeginTag(HtmlTextWriterTag.Table);
xWriter.RenderBeginTag(HtmlTextWriterTag.Tr);
xWriter.RenderBeginTag(HtmlTextWriterTag.Td);
xWriter.Write("Hello world");
xWriter.RenderEndTag();
xWriter.RenderEndTag();
xWriter.RenderEndTag();

xWriter.AddAttribute("src", "logo.gif");
xWriter.RenderBeginTag(HtmlTextWriterTag.Img);
xWriter.RenderEndTag();
}

And here is the output

<table>
<tr>
<td>Hello world</td>
</tr>
</table><img src="logo.gif" />

Why attributes are not added to my table tag, but OK for img tag?

Do I miss something?
--
Regards
Hardy