when selecting different radio button option, the page is not updating/refreshing content

For example, there is a radio option as follows:

Application Type : Single   Joint    

When selecting either option, I wanting to update the page so a Panel will appear or disappear according to which radio button is selected.

i.e. if single option -- then the 2nd application panel disappears.

I have gone into the 'events', 'checked changed' section and added the attached scripting...but the panels are appearing or disappearing when pressing the radio button options.

I know the panels do work as when this page is loaded, is pulls current record from db and displays 1 or both panels fine...just seems to be this radio button is not updating the screen propertly.
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protected void RadioButton_ApplicationTypeJoint_CheckedChanged(object sender, EventArgs e)
        {
            Panel_PersonalDetails_App2.Visible = true;
        }
 
        protected void RadioButton_ApplicationTypeSingle_CheckedChanged(object sender, EventArgs e)
        {
            Panel_PersonalDetails_App2.Visible = false;
        }