Get Sick while design component using Visual Web Express 2008

[coldboyqn]

Hi you guy!
I am using Visual Web Express 2008 to design a server controls (a component).
The control is almost very simple.

protected override void RenderContents( HtmlTextWriter writer)
{
base.RenderCont ents(writer);
XElement span = new XElement("span" ,
new XAttribute("sty le", "color: #FFF000; font-size: 20pt;"),
"normal text",
new XElement("b", "bold_text" )
);
writer.Write(sp an.ToString());
}

As you can see, it just writes some text.
But, for example, I change the value of color, save all files, and then refresh the design with the hope that there will be change.
But, there still no change. I try refresh button up to 10 times but there no change.
Some time it changes (in some accidental way, which I cannot control).

I change some property/method of the component and want the design to change it, but It never works. I feel really sick.

Any help/work around would be much appreciated.