[FIXED-EXTJSIV-297] tree panel in accordion layout

[stuchy]

I get following error when I click on an accordion element:
comp.animate is not a function

I reconstruated that error with the accordion in the PR5-examples directory by replacing the first common panel with a tree panel.

var item1 = new Ext.tree.TreePanel({
                title: 'Accordion Item 1',
            });

            var item2 = new Ext.Panel({
                title: 'Accordion Item 2',
                html: '<empty panel>',
                cls:'empty'
            });

            var item3 = new Ext.Panel({
                title: 'Accordion Item 3',
                html: '<empty panel>',
                cls:'empty'
            });

            var item4 = new Ext.Panel({
                title: 'Accordion Item 4',
                html: '<empty panel>',
                cls:'empty'
            });

            var item5 = new Ext.Panel({
                title: 'Accordion Item 5',
                html: '<empty panel>',
                cls:'empty'
            });

            var accordion = new Ext.Panel({
                region:'west',
                margins:'5 0 5 5',
                split:true,
                width: 210,
                layout:'accordion',
                items: [item1, item2, item3, item4, item5]
            });

            var viewport = new Ext.Viewport({
                layout:'border',
                items:[
                    accordion, {
                    region:'center',
                    margins:'5 5 5 0',
                    cls:'empty',
                    bodyStyle:'background:#f1f1f1',
                    html:'<br/><br/>&lt;empty center panel&gt;'
                }]
            });
        }); 

[TommyMaintz]

This will be fixed in the next release.