RDLC Report toggle visibility problem.

Question

Hi,
        In my app we are using Toggle on visibilty option for the Group.We want the rows to be visible initially so we have chosen Display options to Show when the report initially runs and set initial toggle to true.

  Now the problem is the report is loading well , but when we are minimising the rows.the last row in each page of the report is getting vanished.and its appearing if we refresh the report.

please give me any idea...what mistake we have done...everything seems to be correct...have missed any property...