Thank you for writing back.
Yes, the items are wrapped even when not needed in cases when the control is wider than the items. You can use the following code in order to properly calculate the width of the items:
sender, VisualItemFormattingEventArgs args)
var child = args.VisualItem.Children.Children;
var control =
width = child.Size.Width > control.Width ? child.Size.Width : control.Width;
Size(width - 25, 0);
I hope this helps.
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