How to add xbf files to visual studio project

Question

I have created a class library for Windows Universal Platform (Win 10 UWP).

The library houses some UserControls.

When I add the dll from this library to a W

Answer 1

Try to define your constructor as public and not internal.

Also, your second constructor is calling base but i'm not sure to understand why you have/need it if it does not need any parameters.

Try this code:

public sealed partial class CustomPopupControl : UserControl
{
    public CustomPopupControl()
    {
        this.InitializeComponent();    

        Debug.WriteLine("CustomPopupControl");
    }

    private void OnPopupLoaded(object sender, RoutedEventArgs e)
    {
        this.Popup_Container.HorizontalOffset = (Window.Current.Bounds.Width - Grid_Child.ActualWidth) / 2;
        this.Popup_Container.VerticalOffset = (Window.Current.Bounds.Height - Grid_Child.ActualHeight) / 2;
    }

    internal void OpenPopup()
    {
        Debug.WriteLine("OpenPopup");
        Popup_Container.IsOpen = true;

        var currentFrame = Window.Current.Content as Frame;
        var currentPage = currentFrame.Content as Page;
        currentPage.IsHitTestVisible = false;

        Debug.WriteLine("OpenPopup Done");
    }

    private void OnLayoutUpdated(object sender, object e)
    {
        if (Grid_Child.ActualWidth == 0 && Grid_Child.ActualHeight == 0)
        {
            return;
        }

        double ActualHorizontalOffset = Popup_Container.HorizontalOffset;
        double ActualVerticalOffset = Popup_Container.VerticalOffset;

        double NewHorizontalOffset = (Window.Current.Bounds.Width - Grid_Child.ActualWidth) / 2;
        double NewVerticalOffset = (Window.Current.Bounds.Height - Grid_Child.ActualHeight) / 2;

        if (ActualHorizontalOffset != NewHorizontalOffset || ActualVerticalOffset != NewVerticalOffset)
        {
            Popup_Container.HorizontalOffset = NewHorizontalOffset;
            Popup_Container.VerticalOffset = NewVerticalOffset;
        }
    }
}

Thanks,