What's the preferred way to pass control between Views?

What's a clean way to transition control from a WatchUi.Confirmation to the next view?

I want my app to show 

1. EntryView to enter data. Once the user is done, they hit a "save" affordance. 
2. EntryView shows a WatchUi.Confirmation to confirm the data is correct. 
3. Once the user hits "Confirm" in the Confirmation, I want to show a progress view that uploads the data. 

but the ConfirmationDelegate.onResponse() doesn't seem to be able to call WatchUi.pushView() or WatchUi.switchToView() - neither call changes the current View. 

After my user has entered data, I want to hit a "submit" control and show them a confirmation:

class EntryView extends WatchUi.View {

    // Triggered by the user telling us to save. 
    public function onConfirmSave() as Void {
        var value = self.getValueAsString();
        var dialog = new WatchUi.Confirmation(Lang.format("Save $1$?", [value]));
        WatchUi.pushView(
            dialog,
            new SaveConfirmationDelegate(self),
            WatchUi.SLIDE_RIGHT
        );

        System.println("Done onConfirmSave");
    }

In my ConfirmationDelegate, I'm trying to switch or pop:

    function onResponse(response) {
        // ...
        var progressBar = new WatchUi.ProgressBar(
            "Uploading...",
            null
        );

        WatchUi.pushView(
            progressBar,
            null, // We only supply a delegate if we want to support back. We don't. 
            WatchUi.SLIDE_DOWN
        );

        // WatchUi.switchToView(progressBar, null, WatchUi.SLIDE_UP);

Neither results in the progress view being shown. I've tried returning both `true` and `false` from the onResponse(). 

What's the right way to switch to the new View? 

I've been able to hack around this behavaviour by adding a flag in my EntryView that states we're done. Then, in EntryView.onShow() I call WatchUi.switchView() which seems to work. But that's really ugly. And the simulator shows a flicker of the EntryView being displayed before the next view is drawn.