Thank you for contacting us.
This bug was introduced when we added support for ensuring the visibility of the selected item in Popup mode. The bug is now fixed in the latest SP1 release for Mango but the bug is still present in the NoDo version. Do you have plans to upgrade to Mango soon or you will support two versions of your application? If this is the case we will prepare an internal build of our NoDo version which will have the fix so that you can update your app.
Let me know how to proceed.
the Telerik team
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