control作為tooltip后，外框背景是白色的，并且有邊框。? 我們可以定義 一個樣式去掉。

??? <Style x:Key="ToolTipTransparentStyle" TargetType="ToolTip">
??????? <Setter Property="Background" Value="#FFF7F8FA"/>
??????? <Setter Property="Padding" Value="0,0,0,0"/>
??????? <Setter Property="BorderThickness" Value="0"/>
??????? <Setter Property="BorderBrush">
??????????? <Setter.Value>
??????????????? <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
??????????????????? <GradientStop Color="#FFA3AEB9" Offset="0"/>
??????????????????? <GradientStop Color="#FF8399A9" Offset="0.375"/>
??????????????????? <GradientStop Color="#FF718597" Offset="0.375"/>
??????????????????? <GradientStop Color="#FF617584" Offset="1"/>
??????????????? </LinearGradientBrush>
??????????? </Setter.Value>
??????? </Setter>
??????? <Setter Property="Template">
??????????? <Setter.Value>
??????????????? <ControlTemplate TargetType="ToolTip">
??????????????????? <Border x:Name="Root" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2">
??????????????????????? <Border BorderThickness="1" CornerRadius="1" Padding="{TemplateBinding Padding}">
??????????????????????????? <Border.Resources>
??????????????????????????????? <Storyboard x:Key="Visible State"/>
??????????????????????????????? <Storyboard x:Key="Normal State"/>
??????????????????????????? </Border.Resources>
??????????????????????????? <ContentPresenter Cursor="{TemplateBinding Cursor}" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Margin="{TemplateBinding Padding}"/>
??????????????????????? </Border>
??????????????????? </Border>
??????????????? </ControlTemplate>
??????????? </Setter.Value>
??????? </Setter>
??? </Style>

?

在創建 ToolTip實例的時候，把ToolTip.Style 用上這個樣式就可以了。

參考：http://www.cnblogs.com/eagle1986/archive/2012/05/12/2497189.html

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