When will Sencha Touch Charts handle events on DrawComponent Sprites? - sencha-touch-2

Question

In the Sencha Touch Charts 2 beta distribution, the Drawing guide example code has an example of a Sprite listening for touch start. The code given fails to draw any sprites, because it fails to insert a canvas onto the DOM. However this can be fixed by replacing this:
//add the component to the panel
Ext.create('Ext.chart.Panel', {
fullscreen: true,
title: 'Yellow Circle',
items: drawComponent
});
with this:
//add the component to the panel
Ext.create('Ext.chart.Panel', {
fullscreen: true,
title: 'Yellow Circle',
chart: drawComponent
});
Now, I'd really like to get the event handling to work. The example code continues with:
// Add a circle sprite
var myCircle = drawComponent.surface.add({
type: 'circle',
x: 100,
y: 100,
radius: 100,
fill: '#cc5'
});
// Now do stuff with the sprite, like changing its properties:
myCircle.setAttributes({
fill: '#ccc'
}, true);
// Remember always to refresh the image
drawComponent.surface.renderFrame();
// or animate an attribute on the sprite
// no need to refresh the image when adding animations.
myCircle.fx.start({
fill: '#555'
});
// Add a touch listener to the sprite
myCircle.addListener('touchstart', function() {
alert('touchstarted!');
});
but that final alert never happens on touch. Any ideas?
drawComponent.addListener('touchstart'... works fine, but is of course not localised to the circle sprite.
--- after more investigation ---
I think the answer is simply that event handling on sprites his not implemented yet. e.g. in touch-charts/src/draw/engine/Canvas.js we have in the definition of Ext.draw.engine.Canvas,
getSpriteForEvent: function(e) {
return null; //TODO!!!
},
OK - time to change the question from 'how?' to 'when?':
'When will Sencha Touch support Sprite event handling?"