'TextBlock Tooltip converter with multiple data contexts

In my TextBlock.ToolTip I try to use a converter with two inputs. The first one Name just works fine. Since the TextBlock is inside a DataGrid, I need to change the data context for the second input ListOfElements.
I tried using the PlacementTarget Keyword but it didn't worked.

I have the following XAML code:

    <TextBlock.ToolTip>
        <TextBlock>
            <TextBlock.Text>
                <MultiBinding Converter="{StaticResource TooltipConverter}">
                    <Binding Path="Name"></Binding>
                    <Binding Path="PlacementTarget.DataContext.ListOfElements" RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=UserControl}"></Binding>
                </MultiBinding>
            </TextBlock.Text>
        </TextBlock>
    </TextBlock.ToolTip>

What I am trying to achieve is accessing two parameters from two different data contexts.

wpfxamldata-bindingdatacontextmultibinding


Solution 1:[1]

Set the ToolTip property to a ToolTip element and bind to this one:

<TextBlock>
    <TextBlock.ToolTip>
        <ToolTip>
            <TextBlock>
                <TextBlock.Text>
                    <MultiBinding Converter="{StaticResource TooltipConverter}">
                        <Binding Path="Name" />
                        <Binding Path="PlacementTarget.DataContext.ListOfElements"
                                 RelativeSource="{RelativeSource Mode=FindAncestor,
                                    AncestorType=ToolTip}" />
                    </MultiBinding>
                </TextBlock.Text>
            </TextBlock>
        </ToolTip>
    </TextBlock.ToolTip>
</TextBlock>

Sources

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Source: Stack Overflow

Solution Source
Solution 1 mm8

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