extjs - Ext JS chart Tooltip not rendering under mouse pointer -

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i trying add tooltips extjs chart. tooltip getting rendered not under mouse pointer. getting rendered near end of page.

ext.create('ext.chart.chart', {  renderto: ext.getbody(),  width: 470,  height: 300,     store: store,  axes: [{                 type: 'numeric',                 minimum: 0,                 minorticksteps: 0,                 maximum: 150,                 position: 'left',                 fields: ['liney', 'greeny', 'yellowy', 'redy'],                 title: 'buffer penetration'              }, {                 type: 'numeric',                 position: 'bottom',                 fields: ['linex', 'areax'],                 title: 'critical chain comp'             }],  series: [             {                 type: 'area',                 axis: 'left',                 xfield: 'areax',                 yfield: ['redy']              },               {                  type: 'area',                  axis: 'left',                  xfield: 'areax',                  yfield: ['yellowy']               },              {                  type: 'area',                  axis: 'left',                  xfield: 'areax',                  yfield: ['greeny']               },              {                 type: 'line',                 axis: 'left',                 fill: false,                 // tip: 'this tip',                 xfield: 'linex',                 yfield: 'liney',                 tips: {                     trackmouse: true,                     width: 140,                     height: 28,                     renderer: function (storeitem, item) {                         // calculate , display percentage on hover                          this.settitle("tooltip text");                     }                 }              }            ]   });

i have code here : http://jsfiddle.net/abhishek1191/vdazu/1076/

i feel doing silly here or maybe there issue extjs library using. highly appreciated


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