added handler for tab switch key combination

MultiTerm.Wpf/View/ShellView.xaml

@@ -14,6 +14,7 @@
              xmlns:protocol_types="clr-namespace:MultiTerm.Protocols.Types;assembly=MultiTerm.Protocols"
              xmlns:helpers="clr-namespace:MultiTerm.Wpf.Helpers"
              mc:Ignorable="d"
+             KeyDown="UserControl_KeyDown"
              d:DesignHeight="600" d:DesignWidth="1200">
     <UserControl.Resources>
         <!-- Value Converters -->

MultiTerm.Wpf/View/ShellView.xaml.cs

@@ -1,5 +1,4 @@
 using MultiTerm.Core.ViewModel;
-using System;
 using System.Windows.Controls;
 
 namespace MultiTerm.Wpf.View;
@@ -11,4 +10,27 @@ public partial class ShellView : UserControl
         InitializeComponent();
         this.DataContext = App.AppHost!.Services.GetService(typeof(ShellViewModel));
     }
+
+    /// <summary>
+    /// Handles key down events for the whole user control.
+    /// </summary>
+    /// <param name="sender"></param>
+    /// <param name="e"></param>
+    private void UserControl_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
+    {
+        // move tab forward
+        if( e.Key == System.Windows.Input.Key.Tab && 
+            e.KeyboardDevice.Modifiers == System.Windows.Input.ModifierKeys.Control )
+        {
+            this.terminalTabControl.SelectedIndex++;
+            e.Handled = true;
+        }
+        // move tab backwards
+        else if ( e.Key == System.Windows.Input.Key.Tab && 
+                  e.KeyboardDevice.Modifiers == (System.Windows.Input.ModifierKeys.Control & System.Windows.Input.ModifierKeys.Shift) )
+        {
+            this.terminalTabControl.SelectedIndex--;
+            e.Handled = true;
+        }
+    }
 }