+ \r
+ addCenter : function(component){\r
+ if(!this.getPersistent()){\r
+ this.add(component, {edge : 'center', width:'100%'});\r
+ }else{\r
+ if(!this.centerScroller){\r
+ this.centerScroller = new qx.ui.container.Composite(new qx.ui.layout.VBox(1)); \r
+ this.add(new qx.ui.container.Scroll(this.centerScroller), {edge : 'center', width:'100%', height:'100%'});\r
+ }\r
+ this.centerScroller.add(component);\r
+ }\r
+ },\r
+ \r