public: 
   ref class PlotPanel : Panel {

   public: 
      PlotPanel () {};

   protected: 
      // Override the default Measure method of Panel

      virtual Size MeasureOverride (Size availableSize) override 
      {
         Size childSize = availableSize;
         for each (UIElement^ child in InternalChildren)
         {
            child->Measure(childSize);
         }
         return availableSize;
      };

   protected: 
      virtual System::Windows::Size ArrangeOverride (Size finalSize) override 
      {
         for each (UIElement^ child in InternalChildren)
         {
            double x = 50;
            double y = 50;
            child->Arrange(Rect(Point(x, y), child->DesiredSize));
         }
         return finalSize;
      };
   };

public class PlotPanel : Panel
{
    // Default public constructor
    public PlotPanel()
        : base()
    {
    }

    // Override the default Measure method of Panel
    protected override Size MeasureOverride(Size availableSize)
    {
        Size childSize = availableSize;
        foreach (UIElement child in InternalChildren)
        {
            child.Measure(childSize);
        }
        return availableSize;
    }
    protected override Size ArrangeOverride(Size finalSize)
    {
        foreach (UIElement child in InternalChildren)
        {
            double x = 50;
            double y = 50;

            child.Arrange(new Rect(new Point(x, y), child.DesiredSize));
        }
        return finalSize; // Returns the final Arranged size
    }
}

Public Class PlotPanel
    Inherits Panel
    'Override the default Measure method of Panel.

    Protected Overrides Function MeasureOverride(ByVal availableSize As System.Windows.Size) As System.Windows.Size
        Dim childSize As Size = CType(availableSize, Size)
        For Each child As UIElement In InternalChildren
            child.Measure(childSize)
        Next
        Return MyBase.MeasureOverride(availableSize)
    End Function
    Protected Overrides Function ArrangeOverride(ByVal finalSize As System.Windows.Size) As System.Windows.Size
        For Each child As UIElement In InternalChildren
            Dim x As Double = 50
            Dim y As Double = 50
            child.Arrange(New Rect(New System.Windows.Point(x, y), child.DesiredSize))
        Next
        Return MyBase.ArrangeOverride(finalSize)
    End Function
End Class