CODE EXAMPLE FOR CSHARP

Popup open close wpf

    <Button Name="CloseThisPopUp" VerticalAlignment="Top" HorizontalAlignment="Right" Content="X">
                                        <Button.Triggers>
                                            <EventTrigger RoutedEvent="Button.Click">
                                                <EventTrigger.Actions>
                                                    <BeginStoryboard>
                                                        <Storyboard>
                                                            <BooleanAnimationUsingKeyFrames Storyboard.TargetName="CloseThisPopUp" Storyboard.TargetProperty="IsOpen">
                                                                <DiscreteBooleanKeyFrame KeyTime="0:0:0" Value="False" />
                                                            </BooleanAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </BeginStoryboard>
                                                </EventTrigger.Actions>
                                            </EventTrigger>
                                        </Button.Triggers>
                                    </Button>