making a control vsisble/hide

Hi,

The SSRS report has two controls. one matrix style control (Tablix2) and the other a table control (Tablix1).

There is a parameter as show which is set as boolean i.e. true or false.
On the report, what expression do I use so that if the "show" flag is set to true then it makes the following changes:

Tablix1.visible = true and Tablix2.Visible = false

Note that I want all the data inside these controls to be hidden or visible as well

Thanks