MahApps.Metro by Jan Karger, Dennis Daume, Brendan Forster, Paul Jenkins, Jake Ginnivan, Alex Mitchell

<PackageReference Include="MahApps.Metro" Version="2.1.1" />

.NET API 3,425,904 bytes

ClosingWindowEventHandlerArgs

public class ClosingWindowEventHandlerArgs : EventArgs

public bool Cancelled { get; set; }

public ClosingWindowEventHandlerArgs()