Update MahApps.Metro/Controls/Panorama.cs
Update MahApps.Metro/Controls/Panorama.cs

Clicking a selected item should deselect it (i.e. toggle). This is particularly useful when the Panorama control is used to select multiple items.

Jack109/MahApps.Metro,ye4241/MahApps.Metro,jumulr/MahApps.Metro,pfattisc/MahApps.Metro,Danghor/MahApps.Metro,psinl/MahApps.Metro,Evangelink/MahApps.Metro,chuuddo/MahApps.Metro,batzen/MahApps.Metro,MahApps/MahApps.Metro,xxMUROxx/MahApps.Metro,p76984275/MahApps.Metro