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$form['user_selection'] = array ('#access' => TRUE,
    '#type' => 'select',
	'#name' => 'name',
	'#weight' => '1',
    '#options' => $lista_usuarios
	);

$form['submit'] = array(
	'#access' => TRUE,
    '#type' => 'submit',
	//'#name' => 'submit_bt',
    '#value' => 'Submit',
	'#weight' => '2'
  );