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copied!<p>I knew whatever I had done earlier was a workaround and it was dirty. As I understood more about MVVM, I kept re-factoring the code. Here's what I did. </p> <p>Added the ICommand Proerty for SaveCommand on MainWindowViewModel, and bound it to the toolbutton on Main Window. It just delegates the call to the currently active WorksSpaceViewModel's SaveCommand. </p> <pre><code> public override ICommand SaveCommand { get { return _currentWorkspace != null ? _currentWorkspace.SaveCommand : new RelayCommand ( null, param => false); } } </code></pre> <p>and as in the original code, where it keeps track of current workspace, made sure I notified the subsystem of the change</p> <pre><code> public ObservableCollection<WorkspaceViewModel> Workspaces { get { if (_workspaces == null) { _workspaces = new ObservableCollection<WorkspaceViewModel>(); _workspaces.CollectionChanged += OnWorkspacesChanged; CollectionViewSource.GetDefaultView(_workspaces).CurrentChanged += new EventHandler(MainWindowViewModel_CurrentChanged); } return _workspaces; } } private void MainWindowViewModel_CurrentChanged(object sender, EventArgs e) { CurrentWorkspace = CollectionViewSource.GetDefaultView(_workspaces).CurrentItem as WorkspaceViewModel; OnPropertyChanged("SaveCommand"); } public WorkspaceViewModel CurrentWorkspace { get { return _currentWorkspace; } set { _currentWorkspace = value; OnPropertyChanged("CurrentWorkspace"); } } </code></pre> <p>that's it, WPF took care of the rest (ie, enabling, disabling button depending on the validations)! </p> <p>Again, thanks for your tip Paul.</p>

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