void setPrefferedHeight(int prefferedHeight) {
    int oldValue = this.prefferedHeight;
    if (oldValue != prefferedHeight) {
      this.prefferedHeight = prefferedHeight;
      propertyChangeSupport.firePropertyChange(ATTR_PREFFERED_HEIGHT, oldValue, this.prefferedHeight);
    }
  }
void setPrefferedHeight(int prefferedHeight)