How to controll a single pane visibility in panels2

I stopped on this one and I'd really need some help or hint:

I created module »custom_panel.module« with this short test code:

<?php
function custom_panel_panels_pane_content_alter($content, $pane, $args, $context)
{
  $content->content = 'some';
  return $content;
}

Of course all panes on page get »some« content.
I'd like control visibility to just one or two panes on a page with if loop in program code. Let's say:

If (some condition) {
  Show me »pane1« and hide all others;
}

This is the last part from my panel-page export with (I believe) a pane, which visibility I'd like to control (»new-9«):

$pane = new stdClass();
  $pane->pid = 'new-9';
  $pane->panel = 'top';
  $pane->type = 'content_field';
  $pane->subtype = 'description';
  $pane->access = array();
  $pane->configuration = array (
    'context' => 'argument_nid_1',
    'style' => 'rounded_corners',
    'override_title' => 1,
    'override_title_text' => 'Opis',
    'css_id' => '',
    'css_class' => '',
    'label' => 'hidden',
    'field_formatter' => 'field_opis:default',
  );
  $pane->shown = '1';
  $display->content['new-9'] = $pane;
  $display->panels['top'][0] = 'new-9';
$page->displays['argument_0-stranke']['display'] =  $display;

Could you please show me, how to control this single pane visibility?

Thank you,
Tom from Slovenia