firePropertyChange("preferredWidth", oldPrefWidth, this.preferredWidth);
changeSupport.firePropertyChange("preferredWidth", oldPrefWidth, this.preferredWidth);
  public void setPreferredWidth(int preferredWidth)  {    int oldPrefWidth = this.preferredWidth;    if (preferredWidth < minWidth)      this.preferredWidth = minWidth;    else if (preferredWidth > maxWidth)      this.preferredWidth = maxWidth;    else      this.preferredWidth = preferredWidth;    firePropertyChange("preferredWidth", oldPrefWidth, this.preferredWidth);  }