Tools > Program Settings
Expand Hidden Resources
Hover mouse over a title in Hidden Resources
Hover over the X that shows up at the right of the title
The tooltip that pops up says "Close" -- this is likely to confuse people, as the operation has nothing to do with closing. It will "unhide" the resource (i.e., delete it from the "hidden resources" list). I suggest you change this text to "Unhide."
