Loading Assetbundles in Editor-script

Hi,

I am trying to use WWW call in a Editor window to load a assetbundle. It does the call but the isDone flag never becomes true.

Is this possible to do or is there another way of load assetbundles in a editor script?

Here is the code I am using:

static WWW _loadedAsset = null;
static void loadAssetBundle()
{
    _loadedAsset = null;
    _loadedAsset = new WWW("file://"+Application.dataPath+"/file.assetbundle");
}
void OnGUI()
{
    if (_loadedAsset == null)
    {
        if (GUILayout.Button("Start") == true)
        {
            loadAssetBundle();
            Debug.Log("START");
        }
    }
}
void Update()
{
    if (_loadedAsset != null)
    {
        if (_loadedAsset.isDone)
        {
            Debug.Log("DONE");
        }
        else
        {
            Debug.Log("Please Wait....");
        }
    }
}