Typo3: External URL should open with target=_blank

I have created a p开发者_JS百科age with the type external URL. In the tab "General" I can specify the protocol and the URL. In another tab I can specify the URL alias and the target. But the target is already _blank. In the frontend the link still opens in the same window. I'm using Typo 4.5.

I had a link which pointed to an external URL. I only tried to set the _blank at the external URL. Now with setting it at both it works.