protected override async Task OpenMayOverrideAsync(object args = null)
		{
			_vm = new BriefcaseContentVM();
			await _vm.OpenAsync();
			RaisePropertyChanged_UI(nameof(VM));

			await BinderCoverView.OpenAsync();
		}
		protected override async Task CloseMayOverrideAsync()
		{
			await BinderCoverView.CloseAsync();

			var vm = _vm;
			if (vm != null)
			{
				await vm.CloseAsync();
				vm.Dispose();
				VM = null;
			}
		}