|Define if the process validation and update model phases
should be executed before change between tabs, when
serverSideTabSwitch = true (if is false, the switch
is done by other way so this property does not have any
effect). Note that if this property is set as false, only a tab
change is done if all input fields inside the form are valid
(including input components outside this panel). By default is true, so both phases are not executed.