The ability to reference the current control via self does not currently include the ability to reference the name of the control. When creating multi lingual apps then control name could be user as the Key to the multi lingual file, is one example. This makes the Text of this control easy because the lookup is done on the same function all the time, just the control name changes.
e.g. This wont work, without Self.Name but you can see the purpose.
Coalesce(LookUp(LanguageStrings, Key = Self.Name "lblAppTitle" And Lang = Dropdown1.SelectedText.code, Value), "missing")