Here’s the playground.
I also need one of the children to also be a StackPanel that will also adaptWidthToChildren, which should have size in pixels with padding, but the playground with it looks exactly the same.
You should not set adaptWidthToChildren = true as the stack panel is already adapting its width according to its children (when isVertical = false): just remove the line that sets this property.
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But it’s the same behaviour with a Rectangle.
Rectangles don’t reorganize their children, that’s what StackPanel is for. So, if you add two children without positionning them (with the left/top properties for eg), they will be one over the other in the rectangle.
Also, for containers other than StackPanel, the adaptWidthToChildren = true property only computes the width as the maximum width of the children, it does not take into account the left/top properties of those controls. Basically, if the root container has a single child it will work as expected, else it probably won’t. If as in your case you have two children, you should put them in a container and position them in this container and make this container a child of the root container:
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