Change border properties of ASCX from code-behind?

[mittalpa]

Hi
I am building a library of asp.net user controls which I am deriving from a custom UserControlBase class which further derives from actual UserControl class. Hierarchy looks like this :

ASCX -> UserControlBase : UserControl

I have this requirement to put a border around all the ASCX's. So, I thought if I can modify UserControlBase it will apply to all ASCXs. I tried following code in Page_Load of UserCOntrolBase but its not working

this.Attributes.Add("style", "border-color:#FFFF66;border-width:4px;border-style:Dashed;");

What should I do to make it work? Please advise.

Thanks
AJ