How to customize the Template of the ToolTipService.ToolTip?

Silverlight provides ToolTipService.ToolTip for basic applications.

However, I want to customize the Template of the ToolTip by 开发者_开发知识库doing something like this:

<TextBlock Text="Hello"  >
  <ToolTipService.ToolTip>
     <TextBlock Text="I can help you." />  <!--replace this with my template-->
  </ToolTipService.ToolTip>
</TextBlock>

I want the Content or Style property of the ToolTip to be able to be set dynamically from a DataContext.

Something to this effect:

<TextBlock Text="Hello" Style="{StaticResource TextBlockWithToolTip}" />

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You're not going to be able to use the Style property in the exact way you want. The ToolTipService.ToolTip property is an Attached Property. You can't use a Style resource to assign a value to an attached property.

However you can use a Style resource to style a ToolTip element. Hence your TextBlock could look like this:-

<TextBlock Text="{Binding SomeProperty}">
    <ToolTipService.ToolTip>
        <ToolTip Style="{StaticResource TipHelp}" />
    </ToolTipService.ToolTip>
</TextBlock> 

Now in your containers Resources you can have a style such as this:-

<Style x:Key="TipHelp" TargetType="ToolTip">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate>
                <TextBlock Text="{Binding SomeOtherProperty}" />
            </ControlTemplate>
        </Setter.Value>
    </Setter> 
</Style>

You can now customise the contents of the ControlTemplate to you desired ToolTip appearance wiring it up with appropriate Binding objects.

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Someone had the same issue and made quite a nice project in CodePlex.

With this, you can even bind the ToolTip text (which was a showstopper for me because I use localization through binding).

Here's the link: link text

Works really great.