ExtJS TreeGrid's Node mouseover event

I have googled and didn't find anything for extjs TreeGrid's mouseover event example. I tried

exTree.on('mouseover', function(node,event){
},this );

but it is not working. I have tried this one as well inside the listeners:

listeners: {
    'mouseover': function(node, event) {


have you tried solutions provided here? there are at least 2 working examples

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