ubiquity dialog shows more buttons every time the partitioner is used

[komputes]

1) Go to Manual Partitioning (Something Else)
2) Click on "New Partition table" to prepare unformated disk
3) Back out by pressing the close button (x)
4) Go Back and repeat

Result:
ubiquity dialog shows more buttons every time the partitioner is used. If you do this 5 times, then the dialog to create a new partition table will have 5 sets of buttons (4 sets too many). All buttons duplicates seem to work.

Expected:
Going back and forth should not cause previously seen dialogs to have more buttons.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubiquity 2.13.7
ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0
Uname: Linux 3.7.0-7-generic i686
ApportVersion: 2.7-0ubuntu2
Architecture: i386
CasperVersion: 1.330
Date: Thu Dec 27 01:52:11 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20121226)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1093933