Andrew,

I did a small sample with your suggestion but it's not working. Below is the code and output.

Notice the last 2 cases where :

Keyboard.FocusedElement - System.Windows.Controls.Button: Activate and Deactivate Pane

but

Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane

 Am I missing something else ?

Thanks,
Claudio.

----------CODE STARTS---------

XAML

<Window x:Class="DeactivatePane.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:igDock="http://infragistics.com/DockManager"
    Title="Window1" Name="win" Height="300" Width="300">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="50"/>           
        </Grid.RowDefinitions>
        <igDock:XamDockManager x:Name="dockManager" Grid.Row="0" >
            <igDock:XamDockManager.Panes>
                <igDock:SplitPane>
                    <igDock:ContentPane x:Name="contentPane" Header="Right Edge Dock Pane">
                        <TextBox>Content Pane</TextBox>
                    </igDock:ContentPane>
                </igDock:SplitPane>
            </igDock:XamDockManager.Panes>
        </igDock:XamDockManager>
        <Button Name="btnActivateAndDeactivate" Content="Activate and Deactivate Pane" Grid.Row="1" Click="btnActivateDeactivate_Click" ></Button>
    </Grid>
</Window>

C#:

    private void btnActivateDeactivate_Click(object sender, RoutedEventArgs e)
        {           
            Console.WriteLine("\n\nActivating Pane");
            contentPane.Activate();
            DisplayActivePane();
            Console.WriteLine("\n\nTrying to Deactivate Pane - Focus on Window (via Focus() method)");           
            win.Focus();
            DisplayActivePane();
            Console.WriteLine("\n\nTrying to Deactivate Pane - Focus on Window (via Keyboard)");
            Keyboard.Focus(win);
            DisplayActivePane();
            Console.WriteLine("\n\nTrying to Deactivate Pane - MoveFocus() method");
            contentPane.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
            DisplayActivePane();
            Console.WriteLine("\n\nTrying to Deactivate Pane - Focus on Button (via Focus() method)");
            btnActivateAndDeactivate.Focus();
            DisplayActivePane();
            Console.WriteLine("\n\nTrying to Deactivate Pane - Focus on Button (via Keyboard)");
            Keyboard.Focus(btnActivateAndDeactivate);
            DisplayActivePane();

        }


        private void DisplayActivePane()
        {
            Console.WriteLine("Keyboard.FocusedElement - " + Keyboard.FocusedElement);
            Console.WriteLine("Current Active Pane - "  +dockManager.ActivePane);
        }

----------CODE ENDS---------

----------OUTPUT START---------

Activating Pane
Keyboard.FocusedElement - System.Windows.Controls.TextBox: Content Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane


Trying to Deactivate Pane - Focus on Window (via Focus() method)
Keyboard.FocusedElement - System.Windows.Controls.TextBox: Content Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane


Trying to Deactivate Pane - Focus on Window (via Keyboard)
Keyboard.FocusedElement - System.Windows.Controls.TextBox: Content Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane


Trying to Deactivate Pane - MoveFocus() method
Keyboard.FocusedElement - System.Windows.Controls.TextBox: Content Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane


Trying to Deactivate Pane - Focus on Button (via Focus() method)
Keyboard.FocusedElement - System.Windows.Controls.Button: Activate and Deactivate Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane


Trying to Deactivate Pane - Focus on Button (via Keyboard)
Keyboard.FocusedElement - System.Windows.Controls.Button: Activate and Deactivate Pane
Current Active Pane - Infragistics.Windows.DockManager.ContentPane Header:Right Edge Dock Pane Content:Content Pane
 

----------OUTPUT ENDS---------