DlangUI: how to change AppFrames?

[Imperatorn]

On Tuesday, 24 October 2023 at 04:38:58 UTC, Ki Rill wrote:
> I know how to change the current AppFrame:
> ```D
> window.mainWidget = myFrame;
> ```
>
> But how do I exit this frame?
>
> I press the button, change to new frame, do the work, and now I 
> want to return to the previous frame. How would I do this?

Saving the previous frame not an option?