Binding a Checkbox Column with a Byte Value 0 or 1

I have a Gridview where i bind the list of values from my model. Now i have a bit field from the DB and it represents yes or no, or true or false using 1 and 0. Now i want to bind this to a Checkbox column and below is what i have

Code:

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<telerik:GridViewCheckBoxColumn  AutoSelectOnEdit="True"  DataMemberBinding="{Binding sIsMain,Mode=TwoWay}"></telerik:GridViewCheckBoxColumn>

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and it give me an Error when i run it.

Code:

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SCRIPT5022: Unhandled Error in Silverlight Application
Code: 4004 
Category: ManagedRuntimeError     
Message: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
  at System.ThrowHelper.ThrowKeyNotFoundException()
  at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
  at System.Windows.ResourceManagerWrapper.GetResourceForUri(Uri xamlUri, Type componentType)

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