Thank you for your question.
Our latest version (Q1 SP2, dll version 220.127.116.11) offers this behavior by default. From your description it seems that you may be using an older version of our suite which does not support this functionality. Could you please check which version of our controls are you using? If you are using an older version, please download and upgrade to SP2.
If it turns out that you are using SP2, please, open a support ticket send us your application so that we cab investigate where your problem comes from.
the Telerik team