CODE EXAMPLE FOR CSHARP

how to close a popup wpf c# on click event

public static class ClosePopupBehavior
{
    public static ContentControl GetPopupContainer(DependencyObject obj)
    {
        return (ContentControl)obj.GetValue(PopupContainerProperty);
    }

    public static void SetPopupContainer(DependencyObject obj, ContentControl value)
    {
        obj.SetValue(PopupContainerProperty, value);
    }

    public static readonly DependencyProperty PopupContainerProperty =
        DependencyProperty.RegisterAttached("PopupContainer",
            typeof(ContentControl), typeof(ClosePopupBehavior)
        , new PropertyMetadata(OnPopupContainerChanged));

    private static void OnPopupContainerChanged(DependencyObject d
        , DependencyPropertyChangedEventArgs e)
    {
        var popup = (Popup)d;
        var contentControl = e.NewValue as ContentControl;

        popup.LostFocus += (sender, args) =>
        {
            var popup1 = (Popup)sender;
            popup.IsOpen = false;
            if (contentControl != null)
                contentControl.PreviewMouseDown -= ContainerOnPreviewMouseDown;
        };
        popup.Opened += (sender, args) =>
        {
            var popup1 = (Popup)sender;
            popup.Focus();
            SetWindowPopup(contentControl, popup1);
            contentControl.PreviewMouseDown -= ContainerOnPreviewMouseDown;
            contentControl.PreviewMouseDown += ContainerOnPreviewMouseDown;
        };
        popup.PreviewMouseUp += (sender, args) =>
        {
            popup.IsOpen = false;
            if (contentControl != null)
                contentControl.PreviewMouseDown -= ContainerOnPreviewMouseDown;
        };
        popup.MouseLeave += (sender, args) =>
        {
            popup.IsOpen = false;
            if (contentControl != null)
                contentControl.PreviewMouseDown -= ContainerOnPreviewMouseDown;
        };
        popup.Unloaded += (sender, args) =>
        {
            popup.IsOpen = false;
            if (contentControl != null)
                contentControl.PreviewMouseDown -= ContainerOnPreviewMouseDown;
        };
    }

    //This is really to handle touch panel, Not sure if it is needed since handle LostFocus.
    //Remove the contentControl stuff if it is not needed
    private static void ContainerOnPreviewMouseDown(object sender
        , MouseButtonEventArgs mouseButtonEventArgs)
    {
        var popup = GetWindowPopup((DependencyObject)sender);
        popup.IsOpen = false;
        ((FrameworkElement)sender).PreviewMouseUp -= ContainerOnPreviewMouseDown;
    }

    private static Popup GetWindowPopup(DependencyObject obj)
    {
        return (Popup)obj.GetValue(WindowPopupProperty);
    }

    private static void SetWindowPopup(DependencyObject obj, Popup value)
    {
        obj.SetValue(WindowPopupProperty, value);
    }

    private static readonly DependencyProperty WindowPopupProperty =
        DependencyProperty.RegisterAttached("WindowPopup",
            typeof(Popup), typeof(ClosePopupBehavior));
}