[flexcoders] basic code behind question

[Tim Romano]

It seems a class whose constructor takes arguments cannot be used as the 
code-behind class. Is that so? When I try to use this class in the root tag of 
my mxml component, there's an error: no default constructor in the base class 
TestArgs. 
Thanks

package
{
    import mx.containers.TitleWindow;
    import mx.controls.LinkButton;
    public class TestArgs extends TitleWindow
    {
        
        public var aLinkButton:LinkButton;
        private var _arg1: String;
        
        //public function TestArgs(){}
        
        public function TestArgs(arg1:String)
        {
            super();
            _arg1 = arg1;
        }
        
    }
}