Usage

First add HandyControl refrence

xmlns:hc="https://handyorg.github.io/handycontrol"

then in your cs

PopupWindow popup = new PopupWindow()
                {
                    MinWidth = 400,
                    Title = "Title",
                    WindowStartupLocation = WindowStartupLocation.CenterScreen,
                    ShowInTaskbar = true,
                    AllowsTransparency = true,
                    WindowStyle = WindowStyle.None
                };

                TextBox txtUsername = new TextBox();

popup.PopupElement = mainStack;
popup.ShowDialog();

Available Properties	Description
PopupElement	Popup Children

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