private void BindingNumericUpDown_ValueChanged(object sender, EventArgs e)
        {
            Value = (int)BindingNumericUpDown.Value;

            // 自定義邏輯(可修正)
            if (!isDragging)
            {
                ThumbMouseUp?.Invoke(this, null);
            }
        }
        private void Thumb_MouseUp(object sender, MouseEventArgs e)
        {
            isDragging    = false;
            curScrollType = ScrollEventType.EndScroll;
            curFocusOn    = FocusOn.Input;

            threadMoving.Abort();

            // scrollBar mouse up event
            ThumbMouseUp?.Invoke(this, e);
        }