BrightSharp.Toolkit/BrightSharp/Generic.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;

namespace BrightSharp
{
    internal partial class Generic
    {
        private const string StyleDictionaryPattern = @"(?<=.+style\.)(.*?)(?=\.xaml)";
        public void CalendarPreviewMouseUp(object sender, MouseEventArgs e)
        {
            if (Mouse.Captured is CalendarItem) { Mouse.Capture(null); }
        }
        public void DatePickerUnloaded(object sender, RoutedEventArgs e)
        {
            if (sender == null) return;
            DependencyObject child = ((Popup)((DatePicker)sender).Template.FindName("PART_Popup", (FrameworkElement)sender))?.Child;
            while (child != null && !(child is AdornerDecorator))
                child = VisualTreeHelper.GetParent(child) ?? LogicalTreeHelper.GetParent(child);
            if (((AdornerDecorator)child)?.Child is Calendar) ((AdornerDecorator)child).Child = null;
        }
    }
}