Update src/PerfView/GuiUtilities/WindowBase.cs
Update src/PerfView/GuiUtilities/WindowBase.cs

Co-Authored-By: vancem <999dfd9dcb6ec44d1c38d40e0b1591f62b17c6dc@microsoft.com>
vancem/perfview,vancem/perfview,vancem/perfview,vancem/perfview,vancem/perfview