DlangUI: how to change AppFrames?

[Ki Rill]

On Tuesday, 24 October 2023 at 05:03:51 UTC, Imperatorn wrote:
> 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?

It crashes if I reset it to the previous one.
```d
button.click = delegate(Widget src) {
     // window.mainWidget = homeLayout.child(0);
     window.mainWidget = myPreviousFrame;
     return true;
};

// crash
```