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aquiring object reference from dhtmlXWindows

I am using the codebase.zip file referenced at Jun 27, 2008 06:34 in :

http://dhtmlx.com/docs/products/kb/index.shtml?cat=15&page=3&q=3055&ssr=yes&s=not%20defined

I am attempting to populate a dropdown list via Javascript. My code is:

var dhxWins = new dhtmlXWindows();
dhxWins.enableAutoViewport(true);
dhxWins.setViewport(0, 0, 900, 5000);
dhxWins.vp.style.border = "#909090 1px solid";
dhxWins.setImagePath("/js/dhtmlxsuite/dhtmlxWindows/codebase/imgs/");
        
var w1 = dhxWins.createWindow("w1", 10, 10, 320, 240);
w1.setText("dhtmlxWindow");    
dhxWins.window('w1').attachURL("/client_specific/acme/addNewUserForm.php");

objWindowContent = window('w1')._frame.contentWindow;

objlist = objWindowContent.getElementById('medCenterLocation');

The last line fails with the error:

uncaught exception: [Exception... "Cannot convert WrappedNative to function" nsresult: "0x8057000d (NS_ERROR_XPC_CANT_CONVERT_WN_TO_FUN)"

Thanks in advance.