def default
      handler_name = @handler_name
      proc {
        comp = @context.elements[handler_name][:content]
        if comp.kind_of?(Proc)
          comp.call
        else
          Context.wipe handler_name
          Context.render comp, handler_name
        end
      }
    end
def default
      handler_name = @handler_name
      proc {
        comp = @context.elements[handler_name][:content]
        if comp.kind_of?(Proc)
          comp.call
        else
          Context.wipe handler_name
          Context.render comp, handler_name
        end
      }
    end
Render the default content for this component as it is defined in the context.