I already answered your other thread and for your convenience I pasted my reply below:
I tested the behavior of the sliding panes with Q2 2009 version, namely 2009. 2. 826 as well as with the latest version 2010.2 826 but everything worked as expected with both.
Would you please examine my test demo and let me know what should I change to reproduce the issue? Once I can observe it locally I will do my best to help.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items