i took the liberty to tweak the advanced search/replace dialog: http://www.lyx.org/trac/changeset/33821
it should now properly size, and i added frames some remaining comments when using it i was missing a replace button. now when one does a "find next" it is not clear what to do when we want to replace the found string i would also put the insert regular expression in the contex menu and remove the button in any case, i hope you like the new layout ed.
