Gets a value indicating whether this AnnDrawDesigner has automatically added TargetObject to the container.
Object.defineProperty(AnnDrawDesigner.prototype, 'isTargetObjectAdded',
get: function()
)
isTargetObjectAdded: boolean; // read-only
true if this AnnDrawDesigner has automatically added TargetObject to the container; otherwise, false.
This property is used by the automation for multi-container support.