Currently, I've found an instance where moving a Grid containing a set of Content Controls, within its parent grid, will cause all content to disappear from view until the Page is closed and re-opened.

This appears to also not be able to be 'resolved' by using an undo stack, pointing to it likely not being a XAML issue.

See attached video.

Repro Steps:

1) Download, unzip, and open the attached 'PageScroller_Project' Project in Noesis Studio.
2) Expand the Navigator Elements until Scren_Left_Layout, and Screen_Right_Layout are visible side-by-side.
3) Drag-and-Drop 'Screen_Right_Layout' to place it above 'Scren_Left_Layout' in the Navigator hierarchy.

Observe how the internal content of the ContentControls within 'Scren_Left_Layout' disappear.

4) Press Ctrl+Z to undo the Element ordering change.

Observe how the internal content of the ContentControls within 'Scren_Left_Layout' still fails to render.

5) Close MainPage.xaml, and re-open it.

Observe how the internal content of the ContentControls within 'Scren_Left_Layout' now renders as expected.

Expected Results: Changing Element order within a Grid doesn't cause content to cease rendering