After Slovenia entered the European Union in 2004 , introduced the Euro currency in 2007 .
After Slovenia entered the European Union in 2004 , joined the Schengen treaty , all of the border controls between Slovenia and Austria ceased on 25 December 2007 .
After Slovenia entered the European Union in 2004 , introduced the Euro currency in 2007 , and joined the Schengen treaty , all of the border controls between Slovenia and Austria ceased on 25 December 2007 .