ASP RadioButton Client Event Not Triggering

I'm dynamically generating rad开发者_StackOverflowio buttons in my code behind and assigning javascript to them as they are created. This javascript will change the value in a hidden field for when a postback is eventually triggered (autopostback on the buttons is disabled). I am using the exact same method with ASP ImageButtons and it works fine but when I do it with the radio buttons the event never triggers the Javascript. I suspect that I may be using the wrong event name but I have tried several (onclick, onCheckedChanged, etc).

Here is a sample of the VB.NETcode - how come this works fine with my button but not my radiobutton!

//This is my hidden field
ClientScript.RegisterHiddenField(Me.UniqueID & "_someVariable", "")
Dim radDefault As RadioButton = New RadioButton()
radDefault.GroupName = "radio buttons"
radDefault.AutoPostBack = False
//This adds the Javascript to set the hidden field with an onClick event
radDefault.Attributes.Add("onClick", "document.forms[0]." & Me.UniqueID & "_someVariable.value='0';document.forms[0].submit();")

The code is simplified as the button generation is actually through an iterator but the same properties are given to each generated radio button.

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the postback caused by pressing the button was actually clearing the value of the hidden field (different behaviour from assigning the javascript to a button)