@NotNull
    @Override
    public String getDimensionServiceKey() {
      @NonNls StringBuilder result = new StringBuilder();
      result.append("Composite");
      for(AbstractVcs vcs: myBaseVcss) {
        result.append(".").append(vcs.getDisplayName());
      }
      return result.toString();
    }
@NotNull
    @Override
    public String getDimensionServiceKey()