Why does the whole page do postback and RadioButton loses its value?

I want a selection from a radio button to run a query to populate a DropDownList. I do not want the whole page to do a postback. My whole page is posting back.

Also, when I copy this page to a test page, the value of the radio button is lost. I need the radio button to drive they query which populates the dropdown.

What am I doing wrong which is causing a full postback?

(The method "FillAppointmentTypes_SelectedIndexChanged" is never executed.)

<asp:ScriptManager ID="ScriptManager1" runat="server">

<asp:UpdatePanel ID="updatePanelToggle" runat="server">

    <div class="form-group">
      <label for="radDoctors" class="col-md-3 control-label">
        Choose your doctor: <span id="asdf"></span>
      <div class="col-md-9">
        <asp:RadioButtonList ID="radDoctors" runat="server" CssClass="" 
    <div class="form-group">
      <label for="ddAppointmentTypes" class="col-md-3 control-label">
        Reason for Visit: <span id="Span1"></span>
      <div class="col-md-9">
        <asp:DropDownList ID="ddAppointmentTypes" runat="server">

I have tried a trigger inside the updatedatePanel and outside the content template, no love:

  <asp:AsyncPostBackTrigger ControlID="radDoctors" EventName="SelectedIndexChanged" />




At the top of your page load event..

Hope this helps

Also maybe set the ChildAsTrigger="true" on the updatepanel

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