Hello Bachar Zeidan,
The reply to your question is the same one we sent here
. So you should use the newly created metakey that will be longer than 256 chars as a title of your items.
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?
Telerik Public Issue Tracking
system and vote to affect the priority of the items