diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index d7849846..8f041544 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index c7da769c..df99fd1e 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/ref/SunnyUI.dll b/Bin/net5.0-windows/ref/SunnyUI.dll
index 8a27ed72..467338de 100644
Binary files a/Bin/net5.0-windows/ref/SunnyUI.dll and b/Bin/net5.0-windows/ref/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index c4d354f2..3f64fb42 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Charts/UILineChart.cs b/SunnyUI/Charts/UILineChart.cs
index 7ea0cdab..782e1b11 100644
--- a/SunnyUI/Charts/UILineChart.cs
+++ b/SunnyUI/Charts/UILineChart.cs
@@ -677,7 +677,7 @@ namespace Sunny.UI
                 StartPoint = StopPoint = e.Location;
             }
 
-            if (e.Button == MouseButtons.Right)
+            if (e.Button == MouseButtons.Right && ContextMenuStrip == null)
             {
                 ZoomBack();
             }
@@ -777,7 +777,7 @@ namespace Sunny.UI
             Invalidate();
         }
 
-        private void ZoomBack()
+        public void ZoomBack()
         {
             if (!IsZoom) return;