**Describe the bug** A clear and concise description of what the bug is. I tried the msft example from: https://docs.microsoft.com/en-us/windows/uwp/design/layout/layout-panels ``` <RelativePanel BorderBrush="Gray" BorderThickness="1"> <Rectangle x:Name="RedRect" Fill="Red" Height="44" Width="44"/> <Rectangle x:Name="BlueRect" Fill="Blue" Height="44" Width="88" RelativePanel.RightOf="RedRect" /> <Rectangle x:Name="GreenRect" Fill="Green" Height="44" RelativePanel.Below="RedRect" RelativePanel.AlignLeftWith="RedRect" RelativePanel.AlignRightWith="BlueRect"/> <Rectangle Fill="Orange" RelativePanel.Below="GreenRect" RelativePanel.AlignLeftWith="BlueRect" RelativePanel.AlignRightWithPanel="True" RelativePanel.AlignBottomWithPanel="True"/> </RelativePanel> ``` It should look like:  But this implementation gives:  **To Reproduce** Steps to reproduce the behavior: 1. Go to '...' 2. Click on '....' 3. Scroll down to '....' 4. See error **Expected behavior** A clear and concise description of what you expected to happen. **Screenshots** If applicable, add screenshots to help explain your problem. **Environment (please complete the following information):** - .net: [e.g. 4.6.2] - IDE [e.g. vs2017] - Version [e.g. 1.0.0] **Additional context** Add any other context about the problem here.
Activity
fixed HandyOrg#784 and optimized MeasureChild method