Wpf Ribbon Control

Question

I would like to be able to invoke a command when a RibbonTab is selected following MVVM. I am generally aware of how to instigate commands but I am unable to find a way to Bind the command to a Ribbon Control Tab.
Any assistance would be appreciated and an example of the RibbonTab xaml binding would be great.

Answer 1

I finally came up with two solutions for my problem both involving Behaviors.

Solution One involved the addition of a "behaviors:EventTrigger" as below:

xaml

<behaviors:Interaction.Triggers>  
                <behaviors:EventTrigger EventName="SelectionChanged">  
                    <behaviors:InvokeCommandAction Command="{Binding RibbonTabSelectionChangedCommand, Mode=OneWay}" CommandParameter="{Binding ElementName=RibbonMainWindow}"/>  
                </behaviors:EventTrigger>  
</behaviors:Interaction.Triggers>  
  

Then within the View Model the Command as below:

ViewModel.cs

 public RelayCommand RibbonTabSelectionChangedCommand { get; private set; }  
      
    public NavigationViewModel()  
    {  
           RibbonTabSelectionChangedCommand = new RelayCommand(RibbonTabSelectionChanged);  
    }  
  
public void RibbonTabSelectionChanged(object parameter)  
{  
      Ribbon ribbon = (Ribbon)parameter;  
     if (ribbon.SelectedIndex == 3)  
     {  
          SelectedViewModel = new ImageViewModel();  
     }  
     else  
     {  
          SelectedViewModel = new CollectionViewModel();  
     }  
}  
  

Solution Two involved the addition of the below to the above xaml solution

xaml

<behaviors:Interaction.Behaviors>  
                <bh:MainWindowRibbonBehavior/>  
</behaviors:Interaction.Behaviors>  
  

Along with the addition of the “MainWindowRibbonBehavior” class

internal class MainWindowRibbonBehavior : Behavior<Ribbon>  
    {  
        protected override void OnAttached() =>  
       AssociatedObject.Loaded += AssociatedObject_Loaded;  
        private void AssociatedObject_Loaded(object sender, RoutedEventArgs e) =>  
          ((NavigationViewModel)(AssociatedObject.DataContext)).RibbonMainWindow = AssociatedObject;  
    }  
  

Finally the View Model was amended as follows:

public Ribbon RibbonMainWindow { get; set; }  
  
public NavigationViewModel()  
{  
       RibbonTabSelectionChangedCommand = new RelayCommand(RibbonTabSelectionChanged);  
}  
  
public void RibbonTabSelectionChanged(object parameter)  
{  
       if (RibbonMainWindow.SelectedIndex == 3)  
       {  
           SelectedViewModel = new ImageViewModel();  
       }  
       else  
       {  
           SelectedViewModel = new CollectionViewModel();  
       }  
}  
  

I trust someone may find this useful?