The IsA filter option, displayed as is child of, only appears for notification attributes that have a class name for their value, including: Class, ClassName, and ElementClass.
To create an IsA filter for one of these notification attributes, select the class and the is child of option from the menus. To apply your filter and exit the dialog box, click OK.
The Notification Log Console then displays only the notifications for instances of the specified class and all of its subclasses.
Only a single class name, without any wildcard characters of any kind, may be specified for an IsA filter.