Repro Steps:

1) Prepare a bitmap image, and include it in the project root.
2) Create a Page
3) Introduce an Image Element to the Page, and select it.
4) Input a Height value into the Image's Height Property, and press [Enter].
5) Click on the Width property, or, click on the RootGrid, then click on the Image once again.

Observe that the Height property collapses to 0 and ignore the input value.

5) Select the Image, and in the 'Source' field, select a bitmap image.

6) Input a Height value into the Image's Height Property, and press [Enter].
7) Click on the Width property, or, click on the RootGrid, then click on the Image once again.

Observe that the Height property is retained, and stays in place.

Expected Results: Image Elements that do not contain a Source are still able to be sized to a specific dimension, and occupy that space on-screen.