Is it a mistake to use the App-class as TypeInTargetAssembly

Is it a mistake to use the App-class for defining the TypeInTargetAssembly of a ComponentResourceKey. Is there some rule for the selection of the target class or is it absolutely not important which class one takes?

The only important thing I have figured out is, that the class is stable and does disappear once, because it is no needed any longer. But are there more thouhgs on this?

I don't think its important (other than the fact that its your class and thus you don't conflict with anyone else).