Combobox highlights all entries when using URL to load data to a form

[frapa02]

When using external php program via a URL to load a combobox in an easyui-dialog form, all entries in the box are orange. Only the item which matches the data in the field should be highlighted in orange. This works fine if I use a <SELECT> with hard coded values. Occurs on both IE and Firefox.
I was unable to investigate as the code is obfuscated in the js files.

Here is an example of how I am defining the combobox:

         <div class="fitem">
            <label>Manager:</label>
            <input id="Manager1" class="easyui-combobox" required="true" name="Manager1" style="width:200px"
               url="get_managers.php"
               valueField="ManagerName" textField="ManagerName">
         </div>

This is with the latest version of EasyUI v 1.2.5.

Paul.