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