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private static readonly double COS_30_DEGREE = 0.866;
protected override Size MeasureOverride(Size availableSize)
{
	foreach (UIElement child in Children)
	{
		var tile = child as FrameworkElement;
		tile.Height = this.ItemLenght;
		tile.Width = (COS_30_DEGREE * this.ItemLenght / 2) * 2;
		tile.Measure(availableSize);
	}
	return base.MeasureOverride(availableSize);
}