public @Nullable String getSelectedRadComponentClassName() {
    if (mySelection.isEmpty()) return null;
    String className = mySelection.get(0).getComponentClassName();
    for (int i = 1; i < mySelection.size(); i++) {
      if (!Objects.equals(mySelection.get(i).getComponentClassName(), className)) {
        return null;
      }
    }
    return className;
  }
public @Nullable String getSelectedRadComponentClassName()