I tried:
1) Create a wxWidgets project
2) Create a new wxSmith dialog xrc based
3) Save all
4) Open xrc file in wxSmith and add a view elements
5) Save everything
6) Open xrc file in Notepad++ and modify some elements
7) Bring Codeblocks to front: Codeblocks
does not detect the modified file (the xrc file) and does not ask anything I tried multiple ways to bring codeblocks to front, because i noted that not all works for file detection (you have to minimize and maximize it, simply by bringing back to front is not enough)
Close the xrc tab wihtin codeblocks, and reopen it from the "resources" tab: Codeblocks reloads and displays the correct modified xrc file
Windows 7 Codeblocks 10747 wx2.8