I have test and the new code to change is in RatingBar.cs

Changing the "for (int i = start; i <= Max; i++)" to "for (int i = Max; i >= start; i--)" is what I want

Perhaps someone can add a property "BottomToTop" True / False and changing the for iteration ?

thank you.

private void RebuildButtons()
        {
            foreach (var ratingBarButton in _ratingButtonsInternal)
            {
                ratingBarButton.MouseMove -= RatingBarButton_MouseMove;
            }
            _ratingButtonsInternal.Clear();             // When fractional values are enabled, the first rating button represents the value Min when not selected at all and Min+1 when fully selected;
            // thus we start with the value Min+1 for the values of the rating buttons.
            int start = IsFractionalValueEnabled ? Min + 1 : Min;
            for (int i = Max; i >= start; i--)
            {
                var ratingBarButton = new RatingBarButton
                {
                    Content = i,
                    ContentTemplate = ValueItemTemplate,
                    ContentTemplateSelector = ValueItemTemplateSelector,
#pragma warning disable CS0618 // Type or member is obsolete
                    IsWithinSelectedValue = i <= Value,
#pragma warning restore CS0618 // Type or member is obsolete
                    Style = ValueItemContainerButtonStyle,
                    Value = i,
                };
                ratingBarButton.MouseMove += RatingBarButton_MouseMove;
                _ratingButtonsInternal.Add(ratingBarButton);
            }
        }

Rating bar completed from bottom to top #3113

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