Hi Rajani,
Thanks for the sample.
We were able to see the issue in the sample. We have noted that, this issue occurs when GridControl, ListView and GridListControls are added to the XPTaskBarBox.
A Bug report has been created and I have forwarded the issue to the developer. The issue will be worked with high priority.
Defect #2955 - XPTaskBarBox containing certain controls jumps up when its right clicked.Thanks,
Purusothaman.R