public static FloatingContainer ShowDialog(
    FrameworkElement dialogContent,
    FrameworkElement element,
    DialogClosedDelegate closedDelegate,
    Size size,
    string title,
    bool allowSizing
)

Public Shared Function ShowDialog(
    dialogContent As FrameworkElement,
    element As FrameworkElement,
    closedDelegate As DialogClosedDelegate,
    size As Size,
    title As String,
    allowSizing As Boolean
) As FloatingContainer