protected override void OnUnloaded()
 {
     this.DataContext = null;
     this.viewModel?.Dispose();
     this.viewModel = null;
 }
 protected override void OnLoaded()
 {
     this.viewModel =
         new ViewModelBrokenObjectLandClaimTooltip(this.ObjectLandClaim, this.ObjectLandClaimPublicState);
     this.DataContext = this.viewModel;
 }