Private properties of the PropertyFieldSPListQuery custom field.
We separate public & private properties to include onRender & onDispose method waited
by the PropertyFieldCustom, witout asking to the developer to add it when he's using
the PropertyFieldSPListQuery.
Private properties of the PropertyFieldSPListQuery custom field. We separate public & private properties to include onRender & onDispose method waited by the PropertyFieldCustom, witout asking to the developer to add it when he's using the PropertyFieldSPListQuery.