Allow to choose which model to check in multi-model file

[CSchoel]

Modelica allows to define a package as a single file, e.g.

package MyPackage
  model MyFirstModel
    Real x(start=0, fixed=true);
  equation
    der(x) = 1;
  end MyFirstModel;
  model MySecondModel
    Real x(start=0, fixed=true);
  equation
    der(x) = 2;
  end MySecondModel;
end MyPackage;

In such a file the "Check Model" feature returns the error message

Error: Cannot instantiate HHmodelica.Modular due to class specialization PACKAGE.

It would be nice to be able to select from a dropdown menu to check either MyFirstModel or MySecondModel and not just the whole package.