This property enables or disables the use of the nested labels callback interface. If this property is enabled, you must create your own version of the callback which must implement all of the abstract methods listed in TDGNestedLabel.Java:
In addition to creating these methods, you must use the getO1LabelCallback() method to define the callback.
boolean = getNestedLabels();
Can be one of the following:
false. This is the default value.
Note: You may use getO1LabelCallback() to determine if a callback has been assigned with setO1LabelCallback.