Unfortunately, I can not always rely on transient hint, so use another fix found today (uncomment the code).

Sometimes TRootContextMenu is created without canvas (as Bertrand demonstrated with a TBrowser and context menu for
a selected tree view item). So the only thing I can do now - try to preserve z-order for my windows.
Ah??
Merge branch 'master' of https://root.cern.ch/git/root
  o RooMomentMorph
    - Import latest version from Max from 534patches

  o RooMultiBinomial
    - Import latest version from 534patches (minor fixes)

  o RooComplex
    - Version with unified #warn handler for cint and cling

  o RooDataHist
    - Patch from Manuel Schiller from 534patches

  o RooAbsArg
    - Patch from Manuel Schiller from 534patches

  o RooAbsPdf
    - Patch from Manuel Schiller from 534patches

  o RooAbsReal
    - Patch from Manuel Schiller from 534patches

  o RooBanner
    - Increment version tag to v3.58

  o RooDataSet
    - Patch from Manuel Schiller from 534patches
    - Import increased string buffer size from 534patches in map<>-based ctor

  o RooHistPdf
    - Patch from Manuel Schiller from 534patches

  o RooRealIntegral
   - Imported fixed version from 534patches

  o BidirMMapPipe
   - Fix for osx/gcc481
 Correct patch for RooMultiBinomial that was applied in the wrong direction
Hell, I'd still hit it :)
Make sure that all classes of libCore are listed in libCore.rootmap
Even better :)
on OSX 10.9 libc++ is the default (only) C++ run-time lib, enable it by default.
add "\n" to most error messages.
finite() is deprecated on OSX 10.9, use isfinite().
silence deprecation warnings also on 10.9.
remove deprecated warnings on OSX 10.9.
Follow changes done configure/make. Renamed libcxx11 to libcxx option.
Fix NULL returns.
Fix consrt/destr leaks.
Fix trailing space.
Formatting, clarification.
From Cristina: coverity fixes.
Merge branch 'master' of http://root.cern.ch/git/root
Only delete if we own, and do delete if we own.