It seems there are no such option in the pop up menu. Search on google also not brings related results.
Juan Pablo Isaza
It's just like when on a page - pressing Control-F while a source file is focused will let you search for words in that source file.
You can search a single file the usual way using Ctrl+F. You can search many by using the tree view; right-click the level you want and choose "Search in all files."