@Override
          public void run(AnActionButton button) {
            ClassNameInputDialog dlg = new ClassNameInputDialog(myProject, mySplitter);
            dlg.show();
            if (dlg.getExitCode() == OK_EXIT_CODE) {
              String className = dlg.getClassName();
              if (className.isEmpty()) return;
              final Class<?> aClass;
              try {
                aClass = Class.forName(className, true, LoaderFactory.getInstance(myProject).getProjectClassLoader());
              }
              catch (ClassNotFoundException ex) {
                Messages.showErrorDialog(mySplitter,
                                         UIDesignerBundle.message("client.properties.class.not.found", className),
                                         UIDesignerBundle.message("client.properties.title"));
                return;
              }
              if (!JComponent.class.isAssignableFrom(aClass)) {
                Messages.showErrorDialog(mySplitter,
                                         UIDesignerBundle
                                           .message("client.properties.class.not.component", className),
                                         UIDesignerBundle.message("client.properties.title"));
                return;
              }
              myManager.addClientPropertyClass(className);
              fillClassTree();
            }
          }
@Override
          public void run(AnActionButton button)