FirstFloor.ModernUI.Windows.Controls.ColorPicker.GetLastOpened C# (CSharp) Method

        internal static ColorPicker GetLastOpened() {
            ColorPicker r = null;
            return _lastColorPicker?.TryGetTarget(out r) == true ? r : null;
        }

        private void PickerButton_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            var picker = ColorPicker.GetLastOpened();

            if (picker?.Popup != null)
            {
                picker.Popup.StaysOpen = true;
            }

            Color = ScreenColorPickerDialog.Pick() ?? Color;

            if (picker?.Popup != null)
            {
                picker.Popup.Focus();
                picker.Popup.StaysOpen = false;
            }
        }