Gets or sets the active container index.
The 0-based index of the active container.
AutomationContainerIndex is called by the automation object to set the index of the active container when multi-container mode is used. After that, all the properties and methods that are called to inquire information about the container must use this value to get the actual AnnContainer object. Usually, from the collection of the containers obtained from AutomationGetContainersCallback.
The default implementation saves the value of AutomationContainerIndex into a local variable and uses it as needed.
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