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Checking Selected Value When DropDownList control loses Focus

Hi, I'm wondering if there is anyway to check the value of a WebDropDownList control on the client side when it loses focus?  I've tried implementing logic on the Focus client side event but it doesn't fire when user changes focus on the control.

I'm have a radio button list inside an updatepanel and depending on the value that is selected from this radio button, the WebDropDown list control is populated with specific values. I need to make sure that a value is selected off of the WebDropDown list before the user can proceed on the form.


Any help would be greatly appreciated.