xubuntu app launcher drag n drop persistency

I do the following to trigger the bug:
1.- Click on the Main Menu (apps launcher, xfce logo, whatever...)
2.- Start a drag n' drop action on any application, but without releasing the mouse left button.
3.- Press ESC key like cancelling the drag n' drop action. Main menu closes. Then I release mouse left button.
4.- Open the main menu again and move the mouse cursor over any application. It seems last drag n' drop action is persistant.

It' my first bug report. If I did something wrong, please let me know for future reference. Thank you in advance.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xfce4-panel 4.11.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
Uname: Linux 3.13.0-48-generic i686
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: i386
CurrentDesktop: XFCE
Date: Sat Apr 4 19:06:04 2015
InstallationDate: Installed on 2014-12-04 (121 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
SourcePackage: xfce4-panel
UpgradeStatus: No upgrade log present (probably fresh install)