DateTimePicker memory leak

Start by reproducing the leak with the provided MainWindow/MyWindow example and repeated DateTimePicker window creation and closure. Inspect the DateTimePicker event subscriptions added around version 4.4.0 and verify that closing or removing the control no longer retains it in memory.

Found this leak when update from 4.0.1 to 4.5.0. I looked at the code and found added some event in version 4.4.0 for this element.
If you open and then close window or remove element with dtp one of event don't detach and dtp remains in memory.
We can repeat this. Create window with button, on button click open new window with dtp, close window and repeat this 10-100 times.
.NET Framework 4.7.2

<Window x:Class="TestMemoryLeak.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TestMemoryLeak"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Button Width="100"
                Height="200"
                Content="Push me"
                Click="ButtonBase_OnClick"/>
    </Grid>
</Window>

private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
    {
        var mw = new MyWindow();
        mw.Show();
    }

<Window x:Class="TestMemoryLeak.MyWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
        mc:Ignorable="d"
        WindowStyle="ToolWindow"
        Title="Window" Height="100" Width="100">
    <Grid>
        <xctk:DateTimePicker Height="Auto"
                             VerticalContentAlignment="Center"
                             FontSize="15"
                             Padding="0,-2,0,0"
                             Format="Custom"
                             FormatString="dd MMMM yyyy"
                             AutoCloseCalendar="True"
                             ClipValueToMinMax="True"
                             TimePickerVisibility="Collapsed"
                             Background="Transparent" />

    </Grid>
</Window>