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IDispatch Methods
IDispatchEx is a subclass of IDispatch therefore, any object that supports the IDispatchEx interface also has implementations of the IDispatch methods:
These methods behave as defined by IDispatch except that they might provide additional support as defined by IDispatchEx. For example, IDispatchEx::Invoke should support the same values as IDispatchEX::InvokeEx (for example, DISPID_THIS, DISPATCH_CONSTRUCT). This allows an implementation of IDispatchEx::Invoke to simply delegate calls to IDispatchEx::InvokeEx. An object that supports both IDispatch and IDispatchEx might also choose to provide this additional support in IDispatch::Invoke.
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