Arrange ui in circular formation in wpf using c# (Custom Panel)

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C#

WPF

custom-controls

protected override Size ArrangeOverride(Size arrangeBounds)
        {
            Point currentPosition = new Point(OuterRadius, InnerRadius);
            int countChild = Children.Count - 1, i, j = 2, count = 0;
            double angle = 2 * Math.PI / 7, k = 0;
            double offsetOfx = 0.0, offsetOfy = 0.0;
            for (i = 0; i <= countChild; i++)
            {
                if (i == 0)
                {
                    UIElement child = Children[i];
                    Rect childRec = new Rect(117, 117, 48, 20);
                    child.Arrange(childRec);
                }
                else
                {
                    for (j = i; j <= countChild; j++)
                    {
                        count++;
                        if (count <= 7)
                        {
                            UIElement child = Children[j];
                            double currentAngle = j * angle;
                            offsetOfx = Math.Sin(currentAngle) * (OuterRadius + InnerRadius) / 2;
                            offsetOfy = (1 - Math.Cos(currentAngle)) * (OuterRadius + InnerRadius) / 2;
                            Rect childRec = new Rect(
                              new Point(currentPosition.X - child.DesiredSize.Width / 2, currentPosition.Y - child.DesiredSize.Height / 2),
                              new Point(currentPosition.X + child.DesiredSize.Width / 2, currentPosition.Y + child.DesiredSize.Height / 2));
                            child.Arrange(childRec);
                        }
                        else
                        {
                            break;
                        }

                        currentPosition.X = offsetOfx + OuterRadius;
                        currentPosition.Y = offsetOfy + (OuterRadius - InnerRadius) / 2;
                    }
                }
                if (i == 0)
                    i = 0;
                else
                    i = j - 1;
                count = 0;

                currentPosition.X = offsetOfx + OuterRadius;
                currentPosition.Y = offsetOfy + (OuterRadius - InnerRadius) / 2;
            }
            return new Size(2 * OuterRadius, 2 * OuterRadius);
        }

I try this program,

this program used to arrange the buttons in single circle only, if the 1st 7 buttons are arrange in one circle and next 7 buttons are arrange in another big circle , this shape was circle of circle,,, so what should i change in this program. please help to resolve me