Bind Menu Item to Tab index in XAML

I have a menu and a tab control on my WPF gui. I've hidden the tabs from the user so that all pages can only be accessed via menu items or key-shortcuts.

The desired behavior I want is this:

Operator selects 'Help->About' or 'Help->Version History' from my menu and the corresponding tab index for the 'About tab' or 'VersionHistory tab' becomes the 'selected index'.

I'm using MVVM pattern, and currently accomplishing this with a MainTabIndex property that is the go-between: selecting a menu binds to a command which updates the MainTabIndex property, which is bound to the Tab control.

Is there anyway to do this with just XAML? Or a better approach other than using my ViewModel to handle this GUI-only functionality?

My code example, as I've got it now, is listed below:

<TabControl x:Name="MainTabControl"
                    Margin="0,21,0,-25"
                    Background="{x:Null}"
                    BorderBrush="{x:Null}"
                    SelectedIndex="{Binding MainTabIndex,
                                            Mode=TwoWay,
                                            UpdateSourceTrigger=PropertyChanged}"
                    TabStripPlacement="Bottom">

... rest of TabControl deleted for clarity

                <MenuItem Command="{Binding UpdateDisplayedTab}" Header="_About"><MenuItem.CommandParameter><System:Int32>3</System:Int32></MenuItem.CommandParameter></MenuItem>

... notice I'm passing in the value of 3 to the command, which is the tab index of the 'About' page.