[cgiapp] prerun_mode if rm already set?

[pktm]

Hello!
I have a fillout-form with 2 buttons in which users have to review their 
given information from a further form.
If the one button (named 'back') gets clicked, the user want's to change 
his given information.
Else, he would submit his data.
Now, I thougt i can check for the runmode ('save') given in the 
review-form by a hidden-field and set the correct runmode.

workflow:
fillout-form  <-----+
        |                 |
        V                 |
    review -->--->---+
        |                 |
        V                 |
submit the data or -+
Now my code:
sub cgiapp_prerun {
     my $self = shift;
     if( $self->get_current_runmode() eq 'save' ){
         my $q = $self->query();
         if( defined($q->param('back')) ){
             $self->prerun_mode('showForm');
#print STDERR $self->get_current_runmode();
             $q->param(-name=>'error', -value=>1);
         }
     }
} # /cgiapp_prerun
This doesn't work.
Anytime the button 'back' gets clicked, I saw the fillout-form AND the 
review-form.
The output to STDERR returns 'save', although I set it to 'showForm'...
mfg pktm

PS: sry for the typos, I'm a german programmer
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