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15509468
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2013-03-19T20:12:24.600
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2013-03-19T20:12:24.600
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I have handled this sort of situation in the past by bringing in the concept of a <code>WindowManager</code>, which is a horrible name for it, so let's pair it with a <code>WindowViewModel</code>, which is only slightly less horrible - but the basic idea is: <pre><code>public class WindowManager { public WindowManager() { VisibleWindows = new ObservableCollection<WindowViewModel>(); VisibleWindows.CollectionChanged += OnVisibleWindowsChanged; } public ObservableCollection<WindowViewModel> VisibleWindows {get; private set;} private void OnVisibleWindowsChanged(object sender, NotifyCollectionChangedEventArgs args) { // process changes, close any removed windows, open any added windows, etc. } } public class WindowViewModel : INotifyPropertyChanged { private bool _isOpen; private WindowManager _manager; public WindowViewModel(WindowManager manager) { _manager = manager; } public bool IsOpen { get { return _isOpen; } set { if(_isOpen && !value) { _manager.VisibleWindows.Remove(this); } if(value && !_isOpen) { _manager.VisibleWindows.Add(this); } _isOpen = value; OnPropertyChanged("IsOpen"); } } public event PropertyChangedEventHandler PropertyChanged = delegate {}; private void OnPropertyChanged(string name) { PropertyChanged(this, new PropertyChangedEventArgs(name)); } } </code></pre> note: I'm just throwing this together very haphazardly; you'd of course want to tune this idea to your specific needs. But anywho, the basic premise is your commands can work on the <code>WindowViewModel</code> objects, toggle the <code>IsOpen</code> flag appropriately, and the manager class handles opening/closing any new windows. There are dozens of possible ways to do this, but it's worked in a pinch for me in the past (when actually implemented and not tossed together on my phone, that is)
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1. POGive some command to View in MVVM
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1. USJerKimball
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