update treenode qtip

[mxu]

treenode qtip is given at creation by qtip: 'somthing',
i can read treenode.attributes.qtip into a string, but how can I update qtip text?

[Condor]

Use:

if(node.ui.textNode.setAttributeNS){
    node.ui.textNode.setAttributeNS("ext", "qtip", 'another tip');
}else{
    node.ui.textNode.setAttribute("ext:qtip", 'another tip');
}

or, if you use qtipCfg:{text:'tip'} instead of qtip:'tip':

Ext.QuickTips.getQuickTip().targets[node.ui.textNode.id].text = 'another tip';