How can I get the current editor in visual studio 2008 using C#

public class Connect : IDTExtensibility2, IDTCommandTarget
{
    public void OnConnection( object application, ext_ConnectMode connectMode,
        object addInInst, ref Array custom )
    {
        _applicationObject = ( DTE2 ) application;
        _applicationObject.Events.SelectionEvents.OnChange += SelectionEvents_OnChange;
    }

    void SelectionEvents_OnChange()
    {
        vsWindowType type = _applicationObject.ActiveWindow.Type;
        // switch (type) { ... }
    }
}

vsWindowType type = _applicationObject.ActiveWindow.Type;