Code:
var drawComponent = Ext.create('Ext.draw.Component', {
    width: 800,
    height: 600,
    renderTo: document.body
}), surface = drawComponent.surface;


surface.add([{
    type: 'circle',
    radius: 10,
    fill: '#f00',
    x: 10,
    y: 10
}, {
    type: 'circle',
    radius: 10,
    fill: '#0f0',
    x: 50,
    y: 50,
    group: 'circles'
}, {
    type: 'circle',
    radius: 10,
    fill: '#00f',
    x: 100,
    y: 100
}]);
In this example, my question is:
How can I get the second sprite?
Is there a method like "get(Id)" or "getBy...()"?
Don't tell me to use the index of the item or the method "add", in some cases, you can't do.