Hi Triet Nguyen Cong,
Thank you for contacting us.
You can follow this request in PITS. Here
you can vote for it, track its status and see when it is going to be implemented.
If you have any other concerns about our controls please let us know.
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.