diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index 117e718b..b9040912 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index b4678996..6afc6b80 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net45/SunnyUI.Common.dll b/Bin/net45/SunnyUI.Common.dll
new file mode 100644
index 00000000..a0a7ac8d
Binary files /dev/null and b/Bin/net45/SunnyUI.Common.dll differ
diff --git a/Bin/net45/SunnyUI.dll b/Bin/net45/SunnyUI.dll
new file mode 100644
index 00000000..b17962c2
Binary files /dev/null and b/Bin/net45/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 58a8e746..e774fef7 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 24571a04..b935fc53 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 4d553b90..49aea1b2 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UIHeaderButton.cs b/SunnyUI/Controls/UIHeaderButton.cs
index ef75a2b0..aab51163 100644
--- a/SunnyUI/Controls/UIHeaderButton.cs
+++ b/SunnyUI/Controls/UIHeaderButton.cs
@@ -354,9 +354,10 @@ namespace Sunny.UI
                 }
             }
         }
+
         public TextImageRelation textImageRelation = TextImageRelation.ImageAboveText;
 
-        [DefaultValue(typeof(TextImageRelation), "ImageAboveText")]
+        [DefaultValue(TextImageRelation.ImageAboveText)]
         [Description("指定图像与文本的相对位置"), Category("SunnyUI")]
         public TextImageRelation TextImageRelation
         {
@@ -367,6 +368,7 @@ namespace Sunny.UI
                 Invalidate();
             }
         }
+
         protected override void OnMouseDown(MouseEventArgs e)
         {
             base.OnMouseDown(e);
@@ -439,15 +441,10 @@ namespace Sunny.UI
 
             switch (textImageRelation)
             {
-                /*case TextImageRelation.Overlay:
-                    {
-
-                    }
-                    break; */
                 case TextImageRelation.TextAboveImage:
-                    { 
+                    {
                         #region  文本在上
-                        e.Graphics.DrawString(Text, Font, color, (Width - sf.Width) / 2, Padding.Top );
+                        e.Graphics.DrawString(Text, Font, color, (Width - sf.Width) / 2, Padding.Top);
 
                         //字体图标
                         if (Symbol > 0 && Image == null)
@@ -458,7 +455,7 @@ namespace Sunny.UI
                                 bcColor = CircleHoverColor;
                             }
 
-                            e.Graphics.FillEllipse(bcColor, (Width - CircleSize) / 2.0f, Height - Padding.Bottom- CircleSize, CircleSize, CircleSize);
+                            e.Graphics.FillEllipse(bcColor, (Width - CircleSize) / 2.0f, Height - Padding.Bottom - CircleSize, CircleSize, CircleSize);
                             e.Graphics.DrawFontImage(Symbol, SymbolSize, SymbolColor,
                                 new RectangleF(
                                     symbolOffset.X + (Width - CircleSize) / 2.0f,
@@ -468,8 +465,8 @@ namespace Sunny.UI
                         }
                         else if (Image != null)
                         {
-                            e.Graphics.DrawImage(Image, (Width - ImageSize.Width) / 2.0f, Height - Padding.Bottom - ImageSize.Height+imageTop, ImageSize.Width, ImageSize.Height);
-                        } 
+                            e.Graphics.DrawImage(Image, (Width - ImageSize.Width) / 2.0f, Height - Padding.Bottom - ImageSize.Height + imageTop, ImageSize.Width, ImageSize.Height);
+                        }
                         #endregion
                     }
                     break;
@@ -502,8 +499,8 @@ namespace Sunny.UI
                         #endregion
                     }
                     break;
-                case TextImageRelation.TextBeforeImage :
-                    { 
+                case TextImageRelation.TextBeforeImage:
+                    {
                         #region  文本在前
                         e.Graphics.DrawString(Text, Font, color, Padding.Left, (Height - sf.Height) / 2);
 
@@ -516,7 +513,7 @@ namespace Sunny.UI
                                 bcColor = CircleHoverColor;
                             }
 
-                            e.Graphics.FillEllipse(bcColor, Width - Padding.Right - CircleSize, (Height - CircleSize) / 2.0f,  CircleSize, CircleSize);
+                            e.Graphics.FillEllipse(bcColor, Width - Padding.Right - CircleSize, (Height - CircleSize) / 2.0f, CircleSize, CircleSize);
                             e.Graphics.DrawFontImage(Symbol, SymbolSize, SymbolColor,
                                 new RectangleF(
                                     symbolOffset.X + Width - Padding.Right - CircleSize,
@@ -531,7 +528,7 @@ namespace Sunny.UI
                         #endregion
                     }
                     break;
-                default :
+                default:
                     {
                         #region  图片在上
                         //字体图标
@@ -555,12 +552,12 @@ namespace Sunny.UI
                         {
                             e.Graphics.DrawImage(Image, (Width - ImageSize.Width) / 2.0f, ImageTop, ImageSize.Width, ImageSize.Height);
                         }
-                         
+
                         e.Graphics.DrawString(Text, Font, color, (Width - sf.Width) / 2, Height - Padding.Bottom - sf.Height);
                         #endregion
                     }
                     break;
-            } 
+            }
         }
 
         [DefaultValue(null)]
diff --git a/SunnyUI/SunnyUI.csproj b/SunnyUI/SunnyUI.csproj
index 16b759cf..fa1290a1 100644
--- a/SunnyUI/SunnyUI.csproj
+++ b/SunnyUI/SunnyUI.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 <PropertyGroup>
-	<TargetFrameworks>net5.0-windows;netcoreapp3.1;net40</TargetFrameworks>
+	<TargetFrameworks>net5.0-windows;netcoreapp3.1;net40;net45</TargetFrameworks>
 	<ProjectGuid>{AB1CB247-E20B-4CBE-B269-570ADDD96C53}</ProjectGuid>
 	<UseWindowsForms>true</UseWindowsForms>
 	<RootNamespace>Sunny.UI</RootNamespace>
@@ -66,6 +66,12 @@
 	<Reference Include="System.Design" />
 </ItemGroup>
 
+<ItemGroup Condition="'$(TargetFramework)' == 'net45'">
+    <Reference Include="System.Windows.Forms" />
+    <Reference Include="System.Web.Extensions" />
+    <Reference Include="System.Design" />
+</ItemGroup>
+
 <ItemGroup>
     <Compile Update="Properties\Resources.Designer.cs">
 		<DesignTime>True</DesignTime>