Language Reference Guide : System Classes : AppSource Class : FindTag Method
 
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FindTag Method
The FindTag method returns the index of the specified tag in the TaggedValues array of this application.
This method has the following syntax:
index = AppSource.FindTag(tag = varchar(256))
This method has the following parameter:
tag
(Required) Specifies the name of the tag in the TaggedValues array
This method returns the index, or 0 if an entry for this tag is not present.