enhance: optimize input elements.

src/Shared/HandyControl_Shared/Controls/Attach/InfoElement.cs

@@ -39,7 +39,7 @@ public class InfoElement : TitleElement
     ///     内容高度
     /// </summary>
     public static readonly DependencyProperty ContentHeightProperty = DependencyProperty.RegisterAttached(
-        "ContentHeight", typeof(double), typeof(InfoElement), new FrameworkPropertyMetadata(30.0, FrameworkPropertyMetadataOptions.Inherits));
+        "ContentHeight", typeof(double), typeof(InfoElement), new FrameworkPropertyMetadata(28.0, FrameworkPropertyMetadataOptions.Inherits));
 
     public static void SetContentHeight(DependencyObject element, double value) => element.SetValue(ContentHeightProperty, value);
 
@@ -49,7 +49,7 @@ public class InfoElement : TitleElement
     ///     最小内容高度
     /// </summary>
     public static readonly DependencyProperty MinContentHeightProperty = DependencyProperty.RegisterAttached(
-        "MinContentHeight", typeof(double), typeof(InfoElement), new PropertyMetadata(30.0));
+        "MinContentHeight", typeof(double), typeof(InfoElement), new PropertyMetadata(28.0));
 
     public static void SetMinContentHeight(DependencyObject element, double value)
         => element.SetValue(MinContentHeightProperty, value);

src/Shared/HandyControl_Shared/Controls/Attach/TitleElement.cs

@@ -85,6 +85,15 @@ public class TitleElement
     public static Thickness GetMarginOnTheLeft(DependencyObject element)
         => (Thickness) element.GetValue(MarginOnTheLeftProperty);
 
+    public static readonly DependencyProperty MarginOnTheTopProperty = DependencyProperty.RegisterAttached(
+        "MarginOnTheTop", typeof(Thickness), typeof(TitleElement), new FrameworkPropertyMetadata(default(Thickness), FrameworkPropertyMetadataOptions.Inherits));
+
+    public static void SetMarginOnTheTop(DependencyObject element, Thickness value)
+        => element.SetValue(MarginOnTheTopProperty, value);
+
+    public static Thickness GetMarginOnTheTop(DependencyObject element)
+        => (Thickness) element.GetValue(MarginOnTheTopProperty);
+
     public static readonly DependencyProperty PaddingProperty = DependencyProperty.RegisterAttached(
         "Padding", typeof(Thickness), typeof(TitleElement), new FrameworkPropertyMetadata(default(Thickness), FrameworkPropertyMetadataOptions.Inherits));