添加项目文件。

Util.DiagramDesigner/Resources/Styles/ToolTip.xaml

@@ -0,0 +1,38 @@
+<ResourceDictionary 
+  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
+
+  <ResourceDictionary.MergedDictionaries>
+    <ResourceDictionary Source="Shared.xaml" />
+  </ResourceDictionary.MergedDictionaries>
+
+  <!-- SimpleStyles: ToolTip -->
+  <Style x:Key="{x:Type ToolTip}" TargetType="ToolTip">
+    <Setter Property="OverridesDefaultStyle" Value="true"/>
+    <Setter Property="HasDropShadow" Value="True"/>
+    <Setter Property="Template">
+      <Setter.Value>
+        <ControlTemplate TargetType="ToolTip">
+          <Border Name="Border"
+            Background="{StaticResource LightBrush}"
+            BorderBrush="{StaticResource SolidBorderBrush}"
+            BorderThickness="1"
+            Width="{TemplateBinding Width}"
+            Height="{TemplateBinding Height}">
+            <ContentPresenter
+              Margin="4" 
+              HorizontalAlignment="Left"
+              VerticalAlignment="Top" />
+          </Border>
+          <ControlTemplate.Triggers>
+            <Trigger Property="HasDropShadow" Value="true">
+              <Setter TargetName="Border" Property="CornerRadius" Value="4"/>
+              <Setter TargetName="Border" Property="SnapsToDevicePixels" Value="true"/>
+            </Trigger>
+          </ControlTemplate.Triggers>
+        </ControlTemplate>
+      </Setter.Value>
+    </Setter>
+  </Style>
+
+</ResourceDictionary>