Hello faisal,
Please, open a support ticket and send us a runnable sample, making all the necessary js includes, and please, provide us with all required know-how info on the jQuery UI we will need in order to further investigate the problem you experience.
This is a third-party framework, so it might require additional work and setup in order to use it with our controls.
Regards,
Nikolay Tsenkov
the Telerik team