@Override
 protected void addToolbarButtons(ToolbarDecorator toolbarDecorator) {
   AnActionButton specifyUrlButton =
       new AnActionButton(
           ProjectBundle.message("sdk.paths.specify.url.button"), IconUtil.getAddLinkIcon()) {
         @Override
         public void actionPerformed(AnActionEvent e) {
           onSpecifyUrlButtonClicked();
         }
       };
   specifyUrlButton.setShortcut(CustomShortcutSet.fromString("alt S"));
   specifyUrlButton.addCustomUpdater(
       new AnActionButtonUpdater() {
         @Override
         public boolean isEnabled(AnActionEvent e) {
           return myEnabled && !isUrlInserted();
         }
       });
   toolbarDecorator.addExtraAction(specifyUrlButton);
 }