@Nullable
  public JComponent createPropertiesEditor(@NotNull SourceFolder folder, @NotNull JComponent parentComponent,
                                           @NotNull ContentRootPanel.ActionCallback callback) {
    return null;
  }
@Nullable
  public JComponent createPropertiesEditor(@NotNull SourceFolder folder, @NotNull JComponent parentComponent,
                                           @NotNull ContentRootPanel.ActionCallback callback)