radio button issue in SSCE

Hi Experts,

I placed 2 radio buttons in SSCE. I defined  an onSelect event function for each radio button.

when I select first radio button, first radio button event and second radio button event  both are called instead of first event.It is same when I select second radio button.

functions:

function bydate(oEvent)

{

     alert("bydate");

}

function bysfc(oEvent)

{

     alert("bysfc");

}

Is it a bug? or Am I missing anything ?

Also, How can I make one radio button default selected. I gave property Selected = "true" for a radio button. It didn't work.

MII version 15.0 SP5 Patch4

Any help is appreciated.