Hi neil barkhina,
The show-hide issue with the play list is already addressed and it will be included in forthcoming release due by the end of February. If you need this feature urgently we can send a hot fix to you. You should open a support ticket so that we can attach the files there.
Attached you can find an example where this future feature is implemented.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.