API GetTrainerSelectionIndex

Returns the index of the selected trainer service.
 selectionIndex = GetTrainerSelectionIndex()
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;Returns
:;selectionIndex: : The index of the selected trainer service (the index changes when a subclass header is collapsed or expanded. And the subclass headers are included in the index).
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;Example
Prints the index of the selected trainer service to the chatwindow.
 ChatFrame1:AddMessage(GetTrainerSelectionIndex());