function setXprop( $label, $value, $params=FALSE ) {
    if( empty( $label ) || empty( $value ))
      return;
    $xprop = array( 'value' => $value );
    $toolbox = new calendarComponent();
    $xprop['params'] = $toolbox->_setParams( $params );
    $this->xprop[$label] = $xprop;
  }
function setXprop( $label, $value, $params=FALSE ) {
    if( empty( $label ) || empty( $value ))
      return;
    $xprop = array( 'value' => $value );
    $toolbox = new calendarComponent();
    $xprop['params'] = $toolbox->_setParams( $params );
    $this->xprop[$label] = $xprop;
  }
function setXprop ( $ label , $ value , $ params = FALSE ) { if ( empty ( $ label ) || empty ( $ value ) ) return ; $ xprop = array ( 'value' => $ value ) ; $ toolbox = new calendarComponent ( ) ; $ xprop [ 'params' ] = $ toolbox -> _setParams ( $ params ) ; $ this -> xprop [ $ label ] = $ xprop ; }
set calendar property x-prop

@author Kjell-Inge Gustafsson <ical@kigkonsult.se>
@since 2.0.7 - 2007-06-21
@param string $label
@param string $value
@param array $params optional
@return void
set calendar property x - prop