showDialog({
    id: 'dialog-id',
    title: 'Title',
    text: 'Text',
    negative: {
        id: 'cancel-button',
        title: 'Cancel',
        onClick: function() { ... }
    },
    positive: {
        id: 'ok-button',
        title: 'OK',
        onClick: function() { ... }
    },
    cancelable: true,
    contentStyle: {'max-width': '500px'},
    onLoaded: function() { ... },
    onHidden: function() { ... }
});