Hello, A simple example: UniTreeView.ClientEvents.ExtEvents -> function afterrender(sender, eOpts) { sender.getView().tip = Ext.create('Ext.tip.ToolTip', { target: sender.getView().getEl(), delegate: '.x-tree-icon', trackMouse: true, renderTo: Ext.getBody(), listeners: { beforeshow: function updateTipBody(tip) { gridColums = sender.getView().getGridColumns(); column = gridColums[tip.triggerEl