Thanks for your answer great tips.
However, after following the following step,
Since you've already recorded your test to make elements merge just change the page node property to FullPath instead of FullPathAndQuery (shown in screenshot FullPath.jpg)
to have changed the page node property of my site, the existing PathAndQuery are still there (SilverlightApp and SilverlightApp0), and the recorded test steps are still pointing to different PathAndQuery (under either SilverlightApp or SilverlightApp0).
Any more knobs that I should twist?