ALEXP. THANK YOU NOW IT WORKS BELOW IS SOLUTION:
Like alexp wrote me i ve created drop down field, and paste in this field "items" this code:
//<code>
$db = JFactory::getDBO();
$db->setQuery("SELECT `id`, `name` FROM #__users");
$rez = $db->loadObjectList();
$items = "|Select...\n";
foreach($rez as $r){
$items .= $r->id."|".$r->name."\n";
}
return trim($items);
//</code>
After that i went to Properties (of this form)->PHP Scripts and paste in "Script called after form has been...
