Wizard cancel button and validate form elements

If there are elements with validate function and I press cancel button, then I obtain form back, with validating error message (no required values or something else).
But I expect execute cancel callback and redirect to 'cancel path'.

What about making some changing in ctools_validate_form function?
Something like:

function ctools_validate_form($form_id, $form, &$form_state) {
  static $validated_forms = array();

  if (!empty($form_state['cancel_validate']) || (isset($validated_forms[$form_id]) && empty($form_state['must_validate']))) {
    return;
  }

and #process or #after_build function on $form['buttons']['cancel'], where we set $form_state['cancel_validate'], when cancel button is clicked.

The task is somehow corrupt validating form with _form_validate($form, $form_state, $form_id) and going to execute cancel callback.

Thanx for that, if it is possible.