fix:issue #3

Ink Canvas/MainWindow.xaml

@@ -226,7 +226,7 @@
                                 <ui:SimpleStackPanel VerticalAlignment="Center">
                                     <TextBlock Foreground="#fafafa" HorizontalAlignment="Center"
                                                VerticalAlignment="Center" FontSize="15" Margin="0,0,0,10"
-                                               Text="开发中..." />
+                                               Text="开发中...请不要点击，可能会导致ICC异常崩溃" />
                                     <ui:SimpleStackPanel Spacing="5">
                                         <ui:SimpleStackPanel Spacing="5" Orientation="Horizontal"
                                                              HorizontalAlignment="Center">

Ink Canvas/MainWindow.xaml.cs

@@ -361,15 +361,17 @@ namespace Ink_Canvas {
                 inkCanvas.Cursor = new Cursor(sri.Stream);
         }
 
-        // 触摸输入，通常隐藏光标
+        // 触摸输入，不隐藏光标
         private void inkCanvas_TouchDown(object sender, TouchEventArgs e)
         {
+            inkCanvas.ForceCursor = false;
             System.Windows.Forms.Cursor.Show();
         }
 
         // 触摸结束，恢复光标
         private void inkCanvas_TouchUp(object sender, TouchEventArgs e)
         {
+            inkCanvas.ForceCursor = false;
             System.Windows.Forms.Cursor.Show();
         }