[wpf] How to open a WPF Popup when another control is clicked, using XAML markup only?

The following uses EventTrigger to show the Popup. This means we don't need a ToggleButton for state binding. In this example the Click event of a Button is used. You can adapt it to use another element/event combination.

<Button x:Name="OpenPopup">Popup
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard>
                        <BooleanAnimationUsingKeyFrames 
                                 Storyboard.TargetName="ContextPopup" 
                                 Storyboard.TargetProperty="IsOpen">
                            <DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="True" />
                        </BooleanAnimationUsingKeyFrames>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>
    </Button.Triggers>
</Button>
<Popup x:Name="ContextPopup"
       PlacementTarget="{Binding ElementName=OpenPopup}"
       StaysOpen="False">
    <Label>Popupcontent...</Label>
</Popup>

Please note that the Popup is referencing the Button by name and vice versa. So x:Name="..." is required on both, the Popup and the Button.

It can actually be further simplified by replacing the Storyboard stuff with a custom SetProperty EventTrigger Action described in this SO Answer

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