const char * CCControlButton::getTitleBMFontForState(CCControlState state)
{
    CCLabelProtocol* label = dynamic_cast<CCLabelProtocol*>(this->getTitleLabelForState(state));
    CCLabelBMFont* labelBMFont = dynamic_cast<CCLabelBMFont*>(label);
    if(labelBMFont != 0)
    {
        return labelBMFont->getFntFile();
    }
    else
    {
        return "";
    }
}