gitk instances create separate icons in Unity bar

[Andrey Gelman]

Distinct instances of gitk create distinct icons in Unity bar, instead of one icon with 2 or 3 white triangles on the left.
Screenshot attached.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.0+14.04.20140423-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,grid,mousepoll,regex,vpswitch,snap,gnomecompat,place,wall,move,resize,imgpng,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
CurrentDesktop: Unity
Date: Wed Jun 18 19:15:08 2014
InstallationDate: Installed on 2011-10-23 (969 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2014-05-25 (24 days ago)

[Stephen M. Webb (bregma)]

Just a note: gitk is a wish (tcl/tk gui) application.