diff --git a/HandyControl/Controls/Cover/CoverView/CoverView.cs b/HandyControl/Controls/Cover/CoverView/CoverView.cs
index 38741cc8..ef0d8483 100644
--- a/HandyControl/Controls/Cover/CoverView/CoverView.cs
+++ b/HandyControl/Controls/Cover/CoverView/CoverView.cs
@@ -182,6 +182,7 @@ namespace HandyControl.Controls
                 _viewContent.ManualHeight = 0;
                 if (_viewContent.Content is FrameworkElement element)
                 {
+                    element.VerticalAlignment = VerticalAlignment.Top;
                     element.Arrange(new Rect(new Size(double.MaxValue, double.MaxValue)));
                     _viewContent.ManualHeight = element.ActualHeight;
                 }
diff --git a/HandyControl/Themes/Styles/Base/CoverViewBaseStyle.xaml b/HandyControl/Themes/Styles/Base/CoverViewBaseStyle.xaml
index 92d44f56..cb75d0f5 100644
--- a/HandyControl/Themes/Styles/Base/CoverViewBaseStyle.xaml
+++ b/HandyControl/Themes/Styles/Base/CoverViewBaseStyle.xaml
@@ -38,7 +38,7 @@
                                 </TransformGroup>
                             </Border.RenderTransform>
                         </Border>
-                        <Border x:Name="PART_Content" Height="0" Grid.Row="1" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
+                        <Border x:Name="PART_Content" MinHeight="30" Height="0" Grid.Row="1" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                             <ContentPresenter Margin="{TemplateBinding Padding}"/>
                         </Border>
                         <Rectangle SnapsToDevicePixels="True" Visibility="{Binding Visibility,ElementName=PART_Triangle}" Grid.Row="1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="28" Margin="{Binding Margin,ElementName=PART_Triangle}" Height="1" Fill="{TemplateBinding Background}">
diff --git a/HandyControlDemo/ViewModel/Basic/ChatBoxViewModel.cs b/HandyControlDemo/ViewModel/Basic/ChatBoxViewModel.cs
index 53b2cb21..aa959105 100644
--- a/HandyControlDemo/ViewModel/Basic/ChatBoxViewModel.cs
+++ b/HandyControlDemo/ViewModel/Basic/ChatBoxViewModel.cs
@@ -4,7 +4,6 @@ using System.Diagnostics;
 using System.IO;
 using System.Media;
 using System.Windows;
-using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Media.Imaging;
 using GalaSoft.MvvmLight;
@@ -21,7 +20,7 @@ namespace HandyControlDemo.ViewModel
 {
     public class ChatBoxViewModel : ViewModelBase
     {
-        private static readonly string AutioCachePath = $"{AppDomain.CurrentDomain.BaseDirectory}Cache";
+        private static readonly string AudioCachePath = $"{AppDomain.CurrentDomain.BaseDirectory}Cache";
 
         private readonly string _id = Guid.NewGuid().ToString();
 
@@ -113,11 +112,11 @@ namespace HandyControlDemo.ViewModel
 
         private void StopRecord()
         {
-            if (!Directory.Exists(AutioCachePath))
+            if (!Directory.Exists(AudioCachePath))
             {
                 try
                 {
-                    Directory.CreateDirectory(AutioCachePath);
+                    Directory.CreateDirectory(AudioCachePath);
                 }
                 catch (Exception e)
                 {
@@ -126,7 +125,7 @@ namespace HandyControlDemo.ViewModel
                 }
             }
 
-            var cachePath = $"{AutioCachePath}\\{Guid.NewGuid().ToString()}";
+            var cachePath = $"{AudioCachePath}\\{Guid.NewGuid().ToString()}";
             ExternDllHelper.MciSendString("stop movie", "", 0, 0);
             ExternDllHelper.MciSendString($"save movie {cachePath}", "", 0, 0);
             ExternDllHelper.MciSendString("close movie", "", 0, 0);
diff --git a/Net40/HandyControlDemo_Net40/ViewModel/Basic/ChatBoxViewModel.cs b/Net40/HandyControlDemo_Net40/ViewModel/Basic/ChatBoxViewModel.cs
index fb50686b..17cce6c0 100644
--- a/Net40/HandyControlDemo_Net40/ViewModel/Basic/ChatBoxViewModel.cs
+++ b/Net40/HandyControlDemo_Net40/ViewModel/Basic/ChatBoxViewModel.cs
@@ -20,7 +20,7 @@ namespace HandyControlDemo.ViewModel
 {
     public class ChatBoxViewModel : ViewModelBase
     {
-        private static readonly string AutioCachePath = $"{AppDomain.CurrentDomain.BaseDirectory}Cache";
+        private static readonly string AudioCachePath = $"{AppDomain.CurrentDomain.BaseDirectory}Cache";
 
         private readonly string _id = Guid.NewGuid().ToString();
 
@@ -112,11 +112,11 @@ namespace HandyControlDemo.ViewModel
 
         private void StopRecord()
         {
-            if (!Directory.Exists(AutioCachePath))
+            if (!Directory.Exists(AudioCachePath))
             {
                 try
                 {
-                    Directory.CreateDirectory(AutioCachePath);
+                    Directory.CreateDirectory(AudioCachePath);
                 }
                 catch (Exception e)
                 {
@@ -125,7 +125,7 @@ namespace HandyControlDemo.ViewModel
                 }
             }
 
-            var cachePath = $"{AutioCachePath}\\{Guid.NewGuid().ToString()}";
+            var cachePath = $"{AudioCachePath}\\{Guid.NewGuid().ToString()}";
             ExternDllHelper.MciSendString("stop movie", "", 0, 0);
             ExternDllHelper.MciSendString($"save movie {cachePath}", "", 0, 0);
             ExternDllHelper.MciSendString("close movie", "", 0, 0);
diff --git a/Net40/HandyControl_Net40/Controls/Cover/CoverView/CoverView.cs b/Net40/HandyControl_Net40/Controls/Cover/CoverView/CoverView.cs
index 38741cc8..ef0d8483 100644
--- a/Net40/HandyControl_Net40/Controls/Cover/CoverView/CoverView.cs
+++ b/Net40/HandyControl_Net40/Controls/Cover/CoverView/CoverView.cs
@@ -182,6 +182,7 @@ namespace HandyControl.Controls
                 _viewContent.ManualHeight = 0;
                 if (_viewContent.Content is FrameworkElement element)
                 {
+                    element.VerticalAlignment = VerticalAlignment.Top;
                     element.Arrange(new Rect(new Size(double.MaxValue, double.MaxValue)));
                     _viewContent.ManualHeight = element.ActualHeight;
                 }
diff --git a/Net40/HandyControl_Net40/Themes/Styles/Base/CoverViewBaseStyle.xaml b/Net40/HandyControl_Net40/Themes/Styles/Base/CoverViewBaseStyle.xaml
index 92d44f56..cb75d0f5 100644
--- a/Net40/HandyControl_Net40/Themes/Styles/Base/CoverViewBaseStyle.xaml
+++ b/Net40/HandyControl_Net40/Themes/Styles/Base/CoverViewBaseStyle.xaml
@@ -38,7 +38,7 @@
                                 </TransformGroup>
                             </Border.RenderTransform>
                         </Border>
-                        <Border x:Name="PART_Content" Height="0" Grid.Row="1" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
+                        <Border x:Name="PART_Content" MinHeight="30" Height="0" Grid.Row="1" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                             <ContentPresenter Margin="{TemplateBinding Padding}"/>
                         </Border>
                         <Rectangle SnapsToDevicePixels="True" Visibility="{Binding Visibility,ElementName=PART_Triangle}" Grid.Row="1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="28" Margin="{Binding Margin,ElementName=PART_Triangle}" Height="1" Fill="{TemplateBinding Background}">