public function setChecked($checked = true)
    {
        $this->clearCache();
        $this->checked = (bool)$checked;
        return $this;
    }
public function setChecked($checked = true)
    {
        $this->clearCache();
        $this->checked = (bool)$checked;
        return $this;
    }
public function setChecked ( $ checked = true ) { $ this -> clearCache ( ) ; $ this -> checked = ( bool ) $ checked ; return $ this ; }
Specifies that an input element should be preselected when the page loads

@param bool $checked
@return RadioButton
Specifies that an input element should be preselected when the page loads