How to get ModelField Value in ComboBox

Hi,

I am using a combobox and I have 3 model fields with it. I can get the values of LocationName and ZipCode by assigning them to Display Field and Value Field. My problem is I don't know where to assign the UserID. I need to pass it as a parameter when calling ChangeLocation function. Another alternative is to call the store and get the records inside it, but I don't know how to do it. I have tried using ComboBoxLocation.getStore().model.element(0).Field s.ElementAt(2). It gives me the details about the modelfield UserID, but not the values. I need the value itself. Please help. Thanks in advance.

Code:

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ext:ComboBox ID="ComboBoxLocation" runat="server" Mode="Local" ForceSelection="true" Editable="false" FieldLabel="ChangeLocation" DisplayField="LocationName" ValueField="ZipCode" Width="300" SelectedIndex="1">
<Store>
      <ext:Store ID="StoreLocations" runat="server">
      <Model>
              <ext:Model ID="Model1" runat="server">
                      <Fields>
                            <ext:ModelField Name="LocationName" />
                            <ext:ModelField Name="ZipCode" />
                            <ext:ModelField Name="UserID" />
                      </Fields>
              </ext:Model>
      </Model>           
      </ext:Store>   
</Store>                                     
      <Listeners>
              <Select Handler="changeLocation(this.getValue());" />                     
      </Listeners>
</ext:ComboBox>

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Hello!

Select event's handler receives the array of selected records as second parameter: http://docs.sencha.com/extjs/4.1.3/#...x-event-select