Hello Sumith Jayasuriya,
The DynamicLayer gets items by request so you never know whether all items have been read or not. So you can't use automatic methods to calculate Min and Max values with DynamicLayer, because it will provide different results depends on the number of items that have been read already. The only way is set MinValue and MaxValue properties manualy. For example, if you get data to show from the SQL server then you can execute 2 requests to calculate Min and Max values before the actual data reading.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!