This test passes a XCallback to a UNO function of the UNO test control.
XCallback is implemented by the JScript class XCallback_Impl. The function
XCallback::func1 is then called from the UNO test control.
On the UNO object the function testInterface is called which takes
a XCallback as parameter. XCallback is implemented in a JScript object.The function
returns a XSimple Interface. Then the UNO object calls XSimple::notify. This test shall
verify the correct conversion of the return value( IDispatch JScript object) to an XSimple object.
out parameter
The a JScript object of class XCallback_Impl is passed to the UNO OleTest Control as parameter.
According to the buttons the OleTest object calls a function on XCallback_Impl that has appropriate type
as out parameter.