* {@link Ext.panel.Panel} when {@link Ext.panel.Panel#frame frame=true}, {@link Ext.window.Window}).* @param {Object} [scope] The scope (`this` reference) in which the functions are executed. Defaults* @param {Object} [options] Options for the listener. See {@link Ext.util.Observable#addListener the* @param {Object} overrides An object containing methods to override/implement on the DDProxy object* @param {Number} opacity The new opacity. 0 = transparent, .5 = 50% visible, 1 = fully visible, etc