How to add a background color to any UI element

Not all UI elements have a background color property so here is a quick way to add it to any element (or part of element):

1. Add a Rectangle element and make it borderless from the Property Inspector
2. Set the background color to the desired one
3. Set its opacity to 25%
4. Move and resize the rectangle to overlay your other element (Data Grid in this case)
5. Group the UI elements together

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You can also set up a border color the same way if needed.