diff --git a/samples/Histogram/AreaHandler.cs b/samples/Histogram/AreaHandler.cs
index 78a99a5..2b85e44 100644
--- a/samples/Histogram/AreaHandler.cs
+++ b/samples/Histogram/AreaHandler.cs
@@ -168,7 +168,7 @@ public void MouseEvent(AreaBase area, ref AreaMouseEvent mouseEvent)
             area.QueueReDrawAll();
         }
 
-        public void MouseCrossed(AreaBase area, int left)
+        public void MouseCrossed(AreaBase area, bool left)
         {
             //throw new NotImplementedException();
         }
diff --git a/samples/Tester/Page15.cs b/samples/Tester/Page15.cs
index 216731a..7fd77a7 100644
--- a/samples/Tester/Page15.cs
+++ b/samples/Tester/Page15.cs
@@ -292,7 +292,7 @@ public void MouseEvent(AreaBase area, ref AreaMouseEvent e)
                 }
             }
 
-            public void MouseCrossed(AreaBase area, int left)
+            public void MouseCrossed(AreaBase area, bool left)
             {
                 //throw new NotImplementedException();
             }
diff --git a/samples/Tester/Page6.cs b/samples/Tester/Page6.cs
index b075d8e..de8fa1f 100644
--- a/samples/Tester/Page6.cs
+++ b/samples/Tester/Page6.cs
@@ -30,7 +30,7 @@ public void MouseEvent(AreaBase area, ref AreaMouseEvent mouseEvent)
                 Console.WriteLine($"mouse ({mouseEvent.X},{mouseEvent.Y}):({mouseEvent.AreaWidth},{mouseEvent.AreaHeight}) down:{mouseEvent.Down} up:{mouseEvent.Up} count:{mouseEvent.Count} mods:{mouseEvent.Modifiers} held:0x{mouseEvent.Held1To64:X}");
             }
 
-            public void MouseCrossed(AreaBase area, int left)
+            public void MouseCrossed(AreaBase area, bool left)
             {
                 Console.WriteLine($"mouse crossed {left}");
             }