Highcharts - Passing Data for Flags in Array. It is not rendered - arrays

Question

I am trying to render 3 flags (experimenting with flags) in a candlestick chart in Highchart, but the flag {x: Date.UTC(2012, 7, 6),title: 'On series'}
Is not getting rendered. Why?
$(function() {
$.getJSON('http://www.highcharts.com/samples/data/jsonp.php?filename=aapl-ohlcv.json&callback=?', function(data) {
// split the data set into ohlc and volume
var ohlc = [],
volume = [],
dataLength = data.length,
arrflag =[
{x: Date.UTC(2012, 7, 17),title: 'On series'},
{x: Date.UTC(2012, 7, 9),title: 'On series'}
];
arrflag.push([
{x: Date.UTC(2012, 7, 6),title: 'On series'}
]);
for (i = 0; i < dataLength; i++) {
ohlc.push([
data[i][0], // the date
data[i][1], // open
data[i][2], // high
data[i][3], // low
data[i][4] // close
]);
volume.push([
data[i][0], // the date
data[i][5] // the volume
])
}
// set the allowed units for data grouping
var groupingUnits = [[
'week', // unit name
[1] // allowed multiples
], [
'month',
[1, 2, 3, 4, 6]
]];
// create the chart
chart = new Highcharts.StockChart({
chart: {
renderTo: 'container',
alignTicks: false
},
rangeSelector: {
selected: 0
},
title: {
text: 'AAPL Historical'
},
yAxis: [{
title: {
text: 'OHLC'
},
height: 200,
lineWidth: 2
}, {
title: {
text: 'Volume'
},
top: 300,
height: 100,
offset: 0,
lineWidth: 2
}],
series: [{
type: 'candlestick',
name: 'AAPL',
id: 'AAPLX',
data: ohlc,
dataGrouping: {
units: groupingUnits
}
}, {
type: 'column',
name: 'Volume',
data: volume,
yAxis: 1,
dataGrouping: {
units: groupingUnits
}
},{
type: 'flags',
name: 'Flags on series',
data: arrflag,
onSeries: 'AAPLX',
shape: 'squarepin'
}]
});
});
});​
Live DEMO

Answer 1

You array of flags has the following value:
arrflag =[
{x: Date.UTC(2012, 7, 17),title: 'On series'},
{x: Date.UTC(2012, 7, 9),title: 'On series'}
];
When you push the other flag you add it to another array, which isn't the expected. So the result will be.
arrflag =[
{x: Date.UTC(2012, 7, 17),title: 'On series'},
{x: Date.UTC(2012, 7, 9),title: 'On series'},
[{x: Date.UTC(2012, 7, 6),title: 'On series'}]
];
Remove [ and ] from the following code.
arrflag.push([
{x: Date.UTC(2012, 7, 6),title: 'On series'}
]);