This PR fixes a bug that didn't allow changing the background color of the ProgressRadial. A BackgroundColor property has been added to the ProgressRadial class with the new operator (so that this property is used instead of the VisualElement BackgroundColor) so that UpdateBackgroundColor can be called when the BackgroundColor has changed.
This PR fixes a bug that didn't allow changing the background color of the ProgressRadial. A BackgroundColor property has been added to the ProgressRadial class with the new operator (so that this property is used instead of the VisualElement BackgroundColor) so that UpdateBackgroundColor can be called when the BackgroundColor has changed.