LayoutTransform also left in Silverlight. (IMHO) Perhaps in WPF this was usually abused or abused, which caused performance problems, so for better understanding of the framework it was never added to Silverlight and by extension to WinRT.
In the Silverlight Toolkit, which should be easy to port, this seems to be a workaround - check out the LayoutTransformer control . I never used it, but it sounds the way you need it.
* Edit 2017-04-24
The WinRT XAML Toolkit has a LayoutTransformControl
.
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