Add sample for NavigationView + NavigationBar usage scenarios

[kazo0]

Would be good to create a small sample app in the Samples repo on using a NavView with a NavBar and dealing with the PaneToggleButton + MainCommand

[DevTKSS]

would like to add a detail to that sample idea, because I had exactly that scenario need few days ago:
I would like to see the NavigationBar Menu Button(expecting this will need it to be set to action instead of Back) target the in this case hidden NavigationView MenuToggleButton. I did try to bind that, in a mvux application, so maybe doing that a bit wrong:
command of the NavBar MainCommand triggered MainModel Task which would set the value of a IState<bool> NavPanOpen in it, but this setup might collide with the split of interest seperation coming from this mvvm/mvux design pattern and also has not been working properly.
Please show where that is correctly placed in which file also using mvux(?) and how to correctly bind that. I understood mvux this way, that we do not want the Page codebehind contain much more than the initializeComponent, but that might be wrong.