Represents a panel created by extension.

class ExtensionPanel extends ChromeObject {
 ExtensionPanel();
 ExtensionPanel.fromProxy(JsObject jsProxy): super.fromProxy(jsProxy);

 /**
  * Appends a button to the status bar of the panel.
  * 
  * [iconPath] Path to the icon of the button. The file should contain a
  * 64x24-pixel image composed of two 32x24 icons. The left icon is used when
  * the button is inactive; the right icon is displayed when the button is
  * pressed.
  * 
  * [tooltipText] Text shown as a tooltip when user hovers the mouse over the
  * button.
  * 
  * [disabled] Whether the button is disabled.
  */
 Button createStatusBarButton(String iconPath, String tooltipText, bool disabled) {
   return _createButton(jsProxy.callMethod('createStatusBarButton', [iconPath, tooltipText, disabled]));
 }
}