类事件

默认情况下，Class_Initialize 事件会自动与每个类关联。

只要基于类实例化对象，就会触发 Class_Initialize。

示例：

Class Main_Class
    Private Sub Class_Initialize                
        ' Initalization code goes here
    End Sub
End Class

'Whenever a class is instantiated, class_initialize event will be called by default.
Set oMain = new Main_Class