In source tree, we have feature to search. The search tab at the footer (please see the attached snapshot). In the search we  are not able to search the with file names. In the options, we see only "Commit Messages", "File Changes" & Authors. If you can add an option to search file name, it will be a great feature. And we will be able to see all searches at one place.

Right in order to search file, I am using the search bar in the "Working Copy" top right area. It is not  a show stopper, as there is a way to search files now. But, it will be nicer if we have all search at one place 

Reference# : request #STSP-6162