flesh out the data scan UI, tweak selection table

UI/MainWindow.axaml.cs

@@ -17,6 +17,7 @@ public partial class MainWindow : Window
     {
         Instance = this;
         InitializeComponent();
+        DataContext = this;
 
         // Force dark mode in designer
         if (Design.IsDesignMode)
@@ -39,4 +40,10 @@ public partial class MainWindow : Window
         Dialog.DialogContent = new Welcome().Content;
         Dialog.IsOpen = true;
     }
+
+    public void OpenDataHandler()
+    {
+        Dialog.IsOpen = true;
+        Dialog.DialogContent = new DataScanning().Content;
+    }
 }