Links with text longer than the width of the TreePanel disappear in Internet Explorer IE 7, but not 8. Like so:

scrnsht.png

Code:
Ext4.create('Ext.tree.Panel', {
                title: 'Assay Data Review',
                width: 250,
                height: 475,
                store: store,
                autoScroll: true,
                scroll: true,
                rootVisible: false,  
                renderTo: 'leftmenupanel',    
                collapsible: true,
                closeable: true,
                lines: false,
                multiSelect: false,
                preventHeader: false,
                resizable: false,       
                singleExpand: false,    
                useArrows: true
});
Don't know if it's related or relevant, but a horizontal scrollbar does not appear despite attempting to set both autoScroll and scroll.