Sometimes "+" is disabled for some reason and the only way to make it possible to add new entry again is to restart VS. Pretty annoying.
VS 2015 Update 5, Windows 8 Pro.
Comments: Can't reproduce this. Maybe you have multiple files selected, or trying to add items to a WinForms control resource?
VS 2015 Update 5, Windows 8 Pro.
Comments: Can't reproduce this. Maybe you have multiple files selected, or trying to add items to a WinForms control resource?