Question

I have a window which hosts various UserControl’s as pages. Is it possible to close the window which I have no reference to from within the usercontrol’s datacontext?
Simplified details:

SetupWindow

    public SetupWindow()
    {
        InitializeComponent();
        Switcher.SetupWindow = this;
        Switcher.Switch(new SetupStart());  
    }

    public void Navigate(UserControl nextPage)
    {
        this.Content = nextPage;
    }

SetupStart UserControl

<UserControl x:Class="...">
 <UserControl.DataContext>
    <local:SetupStartViewModel/>
 </UserControl.DataContext>
 <Grid>
    <Button Content="Continue" Command="{Binding ContinueCommand}"/>
 </Grid>
</UserControl>

SetupStartViewModel

    public SetupStartViewModel()
    {
    }

    private bool canContinueCommandExecute() { return true; }

    private void continueCommandExectue()
    {
        Switcher.Switch(new SetupFinish());
    }

    public ICommand ContinueCommand
    {
        get { return new RelayCommand(continueCommandExectue, canContinueCommandExecute); }
    }

Answer 1

I managed to find a solution from an answer here: How to bind Close command to a button

View-Model:

public ICommand CloseCommand
{
    get { return new RelayCommand<object>((o) => ((Window)o).Close(), (o) => true); }
}

View:

<Button Command="{Binding CloseCommand}" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" Content="Close"/>