FPGACoder/HandyControl/HandyControl_Shared/Themes/Styles/Base/ToolTipBaseStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:hc="clr-namespace:HandyControl.Controls">

    <Style x:Key="ToolTipBaseStyle" TargetType="ToolTip">
        <Setter Property="Padding" Value="0,6"/>
        <Setter Property="Background" Value="White"/>
        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
        <Setter Property="FontSize" Value="12"/>
        <Setter Property="hc:BorderElement.CornerRadius" Value="2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToolTip">
                    <Border Effect="{StaticResource EffectShadow2}" Margin="8" Background="{DynamicResource RegionBrush}" Padding="{TemplateBinding Padding}" BorderThickness="1" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{DynamicResource BorderBrush}">
                        <ContentPresenter Margin="10,0"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

</ResourceDictionary>