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By default, a dataTip message will appear when you mouseover a marker. The message can be formatted through a dataTip method.
http://developer.yahoo.com/yui/charts/#datatip

The dataTip function can either be set as a Configuration Attribute in your chart's constructor
new YAHOO.widget.LineChart( "myContainer", myDataSource,
{
xField: "month",
series: seriesDef,
dataTipFunction: YAHOO.example.myDataTipFunction
} );

or through the set method after the chart has loaded

mychart.set("dataTipFunction", YAHOO.example.myDataTipFunction);

You can listen to the chart's contentReady event to ensure that the chart has loaded before you attempt to set the function.

function loadDataTipFunction()
{
mychart.set("dataTipFunction", YAHOO.example.myDataTipFunction)
}
mychart.on("contentReady", loadDataTipFunction);

Thanks,
Tripp

I can not. I need as in image (dataTip)

Thank you! Of course, I would like to this.