dont close the network list. just hide it so its reusable

windows/WinUI/NetworkListView.xaml

@@ -5,7 +5,7 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:local="clr-namespace:WinUI"
         mc:Ignorable="d" x:Class="WinUI.NetworkListView"
-        Title="ZeroTier One" Height="500" Width="500" Icon="ZeroTierIcon.ico">
+        Title="ZeroTier One" SizeToContent="Width" Height="500" Width="Auto" Icon="ZeroTierIcon.ico">
 	
     <Window.Resources>
         <SolidColorBrush x:Key="GreenBrush" Color="#ff91a2a3"/>

windows/WinUI/NetworkListView.xaml.cs

@@ -17,6 +17,7 @@ using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
 using System.Windows.Threading;
+using System.ComponentModel;
 
 namespace WinUI
 {
@@ -41,6 +42,12 @@ namespace WinUI
         {
         }
 
+        protected override void OnClosing(CancelEventArgs e)
+        {
+            e.Cancel = true;
+            Hide();
+        }
+
         private void onClosed(object sender, System.EventArgs e)
         {
             NetworkMonitor.Instance.UnsubscribeNetworkUpdates(updateNetworks);

windows/WinUI/ToolbarItem.xaml.cs

@@ -29,7 +29,7 @@ namespace WinUI
     {
         private APIHandler handler = APIHandler.Instance;
 
-        private NetworkListView netListView = null;
+        private NetworkListView netListView = new NetworkListView();
         private JoinNetworkView joinNetView = null;
         private AboutView aboutView = null;
         private PreferencesView prefsView = null;
@@ -122,8 +122,9 @@ namespace WinUI
             {
                 netListView = new WinUI.NetworkListView();
                 netListView.Closed += ShowNetworksClosed;
-                netListView.Show();
             }
+
+            netListView.Show();
         }
 
         private void ShowNetworksClosed(object sender, System.EventArgs e)