adding item to window Extjs 4 - extjs

Question

I've been digging my mind all this morning to find the solution to this, I have an Extjs window where I want to put a chart as an item. I'm using Extjs 4, here's my window :
Ext.define('Metrics.view.ChartWin', {
extend: ['Ext.window.Window'],
alias: 'widget.chartwin',
requires :['Ext.chart.*','Ext.Window', 'Ext.fx.target.Sprite', 'Ext.layout.container.Fit', 'Ext.window.MessageBox', 'Metrics.view.DrawChart'],
width: 800,
height: 600,
minHeight: 400,
minWidth: 550,
hidden: false,
shadow: false,
maximizable: true,
title: 'Area Chart',
renderTo: Ext.getBody(),
layout: 'fit',
tbar: [{
text: 'Save Chart',
handler: function() {
Ext.MessageBox.confirm('Confirm Download', 'Would you like to download the chart as an image?', function(choice){
if(choice == 'yes'){
chart.save({
type: 'image/png'
});
}
});
}
}],
items:[{
//I guess the problem comes from here??
xtype : 'drawchart'
}]
});
My chart :
Ext.define('Metrics.view.DrawChart', {
extend: 'Ext.chart.Chart',
alias: 'widget.drawchart',
requires: ['Ext.chart.*'],
renderTo: Ext.getBody(),
width: 700,
height: 600,
animate: true,
store: 'GraphData',
shadow : true,
legend: {
position: 'right'
},
axes: [
{
title: 'Week',
type: 'Numeric',
position: 'left',
fields: ['Week'],
grid : true
},
{
title: 'In Out Backlog',
type: 'Numeric',
position: 'bottom',
fields: ['BL1 Alt']
}
],
theme: 'Red',
series: [
{
//BLA BLA BLA
}]
});
My chart works fine. Now please tell me, how do I add this chart to my window ? I get this error message :
Cannot read property 'isInstance' of undefined
Thank you.

Answer 1

Remove
renderTo: Ext.getBody()
from your chart definition. The Chart should be rendered in the window.
Then instantiate a window and set the chart as an item there:
Ext.create('Ext.window.Window', {
...
items: [{
xtype: 'drawchart'
}]
...
Look at the code here: http://jsfiddle.net/AMx6r/1282/