Add code

Vocab Coverer/MainWindow.xaml.vb

@@ -0,0 +1,7 @@
+Class MainWindow
+    Sub Window_MouseDown(sender As Object, e As MouseButtonEventArgs) Handles Me.MouseDown
+        If e.ChangedButton = MouseButton.Left Then
+            DragMove()
+        End If
+    End Sub
+End Class