diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index 175a208f..3564a414 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index 92937635..50b163e6 100644
Binary files a/Bin/SunnyUI.pdb and b/Bin/SunnyUI.pdb differ
diff --git a/SunnyUI.Demo/Bin/SunnyUI.dll b/SunnyUI.Demo/Bin/SunnyUI.dll
index 175a208f..3564a414 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI/Charts/UIBarChart.cs b/SunnyUI/Charts/UIBarChart.cs
index 79f89c3b..8d3085e0 100644
--- a/SunnyUI/Charts/UIBarChart.cs
+++ b/SunnyUI/Charts/UIBarChart.cs
@@ -55,6 +55,12 @@ namespace Sunny.UI
                 max = 0;
             }
 
+            if ((max - min).IsZero())
+            {
+                max = 100;
+                min = 0;
+            }
+
             UIChartHelper.CalcDegreeScale(min, max, o.YAxis.SplitNumber,
                 out int start, out int end, out double interval);
 
diff --git a/SunnyUI/Forms/UIEditForm.cs b/SunnyUI/Forms/UIEditForm.cs
index 0f627b98..86172af4 100644
--- a/SunnyUI/Forms/UIEditForm.cs
+++ b/SunnyUI/Forms/UIEditForm.cs
@@ -36,6 +36,9 @@ namespace Sunny.UI
 
         public bool IsOK { get; private set; }
 
+        public event EventHandler ButtonOkClick;
+        public event EventHandler ButtonCancelClick;
+
         protected void btnOK_Click(object sender, EventArgs e)
         {
             if (!CheckData())
@@ -43,16 +46,30 @@ namespace Sunny.UI
                 return;
             }
 
-            DialogResult = DialogResult.OK;
-            IsOK = true;
-            Close();
+            if (ButtonOkClick != null)
+            {
+                ButtonOkClick.Invoke(sender,e);
+            }
+            else
+            {
+                DialogResult = DialogResult.OK;
+                IsOK = true;
+                Close();
+            }
         }
 
         private void btnCancel_Click(object sender, EventArgs e)
         {
-            DialogResult = DialogResult.Cancel;
-            IsOK = false;
-            Close();
+            if (ButtonCancelClick != null)
+            {
+                ButtonCancelClick.Invoke(sender,e);
+            }
+            else
+            {
+                DialogResult = DialogResult.Cancel;
+                IsOK = false;
+                Close();
+            }
         }
 
         protected virtual bool CheckData()