fix WLAN menu keyboard accessibility

SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkButton.xaml.cs

@@ -34,5 +34,10 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 			NetworkNameTextBlock.Text = network.Name;
 			SignalStrengthTextBlock.Text = $"{network.SignalStrength}%";
 		}
+
+		public void SetFocus()
+		{
+			Button.Focus();
+		}
 	}
 }

SafeExamBrowser.UserInterface.Desktop/Controls/ActionCenter/NetworkControl.xaml.cs

@@ -62,7 +62,18 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.ActionCenter
 				Popup.IsOpen = Popup.IsMouseOver;
 			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
-			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
+			Popup.Opened += (o, args) =>
+			{
+				Grid.Background = Brushes.Gray;
+				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
+				{
+					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+					if (btn != null)
+					{
+						btn.SetFocus();
+					}
+				}));
+			};
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;
 			WirelessIcon.Child = GetWirelessIcon(0);
 

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkButton.xaml.cs

@@ -34,5 +34,10 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 			NetworkNameTextBlock.Text = network.Name;
 			SignalStrengthTextBlock.Text = $"{network.SignalStrength}%";
 		}
+
+		public void SetFocus()
+		{
+			Button.Focus();
+		}
 	}
 }

SafeExamBrowser.UserInterface.Desktop/Controls/Taskbar/NetworkControl.xaml.cs

@@ -70,6 +70,14 @@ namespace SafeExamBrowser.UserInterface.Desktop.Controls.Taskbar
 			{
 				Background = Brushes.LightGray;
 				Button.Background = Brushes.LightGray;
+				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
+				{
+					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+					if (btn != null)
+					{
+						btn.SetFocus();
+					}
+				}));
 			};
 
 			Popup.Closed += (o, args) =>

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkButton.xaml.cs

@@ -34,5 +34,10 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 			NetworkNameTextBlock.Text = network.Name;
 			SignalStrengthTextBlock.Text = $"{network.SignalStrength}%";
 		}
+
+		public void SetFocus()
+		{
+			Button.Focus();
+		}
 	}
 }

SafeExamBrowser.UserInterface.Mobile/Controls/ActionCenter/NetworkControl.xaml.cs

@@ -62,7 +62,18 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.ActionCenter
 				Popup.IsOpen = Popup.IsMouseOver;
 			}));
 			Popup.MouseLeave += (o, args) => Task.Delay(250).ContinueWith(_ => Dispatcher.Invoke(() => Popup.IsOpen = IsMouseOver));
-			Popup.Opened += (o, args) => Grid.Background = Brushes.Gray;
+			Popup.Opened += (o, args) =>
+			{
+				Grid.Background = Brushes.Gray;
+				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
+				{
+					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+					if (btn != null)
+					{
+						btn.SetFocus();
+					}
+				}));
+			};
 			Popup.Closed += (o, args) => Grid.Background = originalBrush;
 			WirelessIcon.Child = GetWirelessIcon(0);
 

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkButton.xaml.cs

@@ -34,5 +34,10 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 			NetworkNameTextBlock.Text = network.Name;
 			SignalStrengthTextBlock.Text = $"{network.SignalStrength}%";
 		}
+
+		public void SetFocus()
+		{
+			Button.Focus();
+		}
 	}
 }

SafeExamBrowser.UserInterface.Mobile/Controls/Taskbar/NetworkControl.xaml.cs

@@ -70,6 +70,14 @@ namespace SafeExamBrowser.UserInterface.Mobile.Controls.Taskbar
 			{
 				Background = Brushes.LightGray;
 				Button.Background = Brushes.LightGray;
+				Task.Delay(100).ContinueWith((task) => Dispatcher.Invoke(() =>
+				{
+					var btn = WirelessNetworksStackPanel.Children[0] as NetworkButton;
+					if (btn != null)
+					{
+						btn.SetFocus();
+					}
+				}));
 			};
 
 			Popup.Closed += (o, args) =>