Restrict size of the sub report irrespective of the Parameter dependency

Hi,

I have a SSRS report in which there are four sub reports and inside the subreports the chart control is placed.

The reports are accepting parameters as Date so when the user selects a bigger date range all the sub reports aligned get's disturbed. I want to have a fix size for all the sub reports irrespective of the parameter the user selects is it possible??

Thanks,

Hrishikesh