Set border for ToolTip by using ControlTemplate

     

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="160" Width="300">
    <Window.Resources>
        <Style TargetType="{x:Type ToolTip}">
            <Setter Property="Width" Value="100"/>
            <Setter Property="Height" Value="100"/>
            <Setter Property="HasDropShadow" Value="True"/>
            <Setter Property="OverridesDefaultStyle" Value="True"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate 
                        TargetType="{x:Type ToolTip}">
                        <Border Name="Border"
                            BorderBrush="DarkGray"
                            BorderThickness="1"
                            Width="{TemplateBinding Width}"
                            Height="{TemplateBinding Height}"
                            CornerRadius="4">
                            <Border.Background>
                                <LinearGradientBrush 
                                    StartPoint="0,0"
                                    EndPoint="0,1">
                                    <GradientStop 
                                        Color="Snow" 
                                        Offset="0.0"/>
                                    <GradientStop 
                                        Color="Gainsboro" 
                                        Offset="1.0"/>
                                </LinearGradientBrush>
                            </Border.Background>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

    </Window.Resources>

    <Grid>
            <TextBlock Foreground="DarkGray" 
                       VerticalAlignment="Center" 
                       HorizontalAlignment="Center"
                       ToolTip="This is a custom tooltip"
                       Text="Mouse Over for tooltip"/>
    </Grid>
    
</Window>

1.	ToolTip for Border
2.	Using ToolTip for TextBox with TextBox.ToolTip and ToolTip tag
3.	Add ToolTip text to a TextBox
4.	ToolTipService.InitialShowDelay
5.	ToolTip with Image
6.	ToolTipService.Placement="Bottom"
7.	ToolTip with List items
8.	A Tool Tip on a Disabled Control
9.	Disabled Button with ToolTipService
10.	Control the Display Duration and Position of a Tool Tip
11.	Set ToolTip Placement, ShowDuration, VerticalOffset
12.	Set ToolTipService.Placement="Center"
13.	Set drop shadow for a ToolTip
14.	Add Image to ToolTip
15.	Complex ToolTip
16.	ToolTip With Binding

Set border for ToolTip by using ControlTemplate : ToolTip « Windows Presentation Foundation « C# / C Sharp

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