How to give resize event for user control in ASP.NET

I like to know something about ASP.NET. I have developed one usercontrol in ASP.NET using C#. It contains a panel and dynamically created link buttons in it. When the number of button increases , user control size also increasing. I want to use control as header in wepage. I like to know how to give a vertical scrollbar to the usercontrol. And how to place a dynamically created linkbutton to specific location inside the Panel.