add button to tooltip template

Question

Hi i want to add a close button on a validation tooltip, this is the current control template I have

 <ControlTemplate x:Key="ValidationToolTipTemplate">
        <Grid x:Name="Root" Margin="5,0" RenderTransformOrigin="0,0" Opacity="0">
            <Grid.RenderTransform>
                <TranslateTransform x:Name="xform" X="-25"/>
            </Grid.RenderTransform>
            <vsm:VisualStateManager.VisualStateGroups>
                <vsm:VisualStateGroup Name="OpenStates">
                    <vsm:VisualStateGroup.Transitions>
                        <vsm:VisualTransition GeneratedDuration="0"/>
                        <vsm:VisualTransition To="Open" GeneratedDuration="0:0:0.2">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="xform" Storyboard.TargetProperty="X" To="0" Duration="0:0:0.2">
                                    <DoubleAnimation.EasingFunction>
                                        <BackEase Amplitude=".3" EasingMode="EaseOut"/>
                                    </DoubleAnimation.EasingFunction>
                                </DoubleAnimation>
                                <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.2"/>
                            </Storyboard>
                        </vsm:VisualTransition>
                    </vsm:VisualStateGroup.Transitions>
                    <vsm:VisualState x:Name="Closed">
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="0" Duration="0"/>
                        </Storyboard>
                    </vsm:VisualState>
                    <vsm:VisualState x:Name="Open">
                        <Storyboard>
                            <DoubleAnimation Storyboard.TargetName="xform" Storyboard.TargetProperty="X" To="0" Duration="0"/>
                            <DoubleAnimation Storyboard.TargetName="Root" Storyboard.TargetProperty="Opacity" To="1" Duration="0"/>
                        </Storyboard>
                    </vsm:VisualState>
                </vsm:VisualStateGroup>
            </vsm:VisualStateManager.VisualStateGroups>

            <Border Margin="4,4,-4,-4" Background="#052A2E31" CornerRadius="5"/>
            <Border Margin="3,3,-3,-3" Background="#152A2E31" CornerRadius="5"/>
            <Border Margin="2,2,-2,-2" Background="#252A2E31" CornerRadius="5"/>
            <Border Margin="1,1,-1,-1" Background="#352A2E31" CornerRadius="5"/>

            <Border Background="#FFDC000C" CornerRadius="2"/>
            <Border CornerRadius="5">
                <StackPanel Orientation="Horizontal">
                    <TextBlock 
              UseLayoutRounding="false" 
              Foreground="White" Margin="8,4,8,4" MaxWidth="250" TextWrapping="Wrap" Text="{Binding (Validation.Errors)[0].ErrorContent}"/>
                    <Button x:Name="closebtn" Content="X" VerticalAlignment="Top" HorizontalAlignment="Left" Click="closebtn_Click" ></Button>
                </StackPanel>
            </Border>
        </Grid>
    </ControlTemplate>

The close button has an event but when I click the button it doesn't fire

any ideas of why this is happening?