We are aware of this bug with RadDocking control. We will investigate the cause for this issue and we will fix it in one of our future releases. You can track this progress in our Public Issue Tracking System (PITS) with Issue ID = 1992.
Please do not hesitate to contact us if you require any further information.
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