private void LoadDropdown()
        {
            cboWindows.Items.Clear();
            var windows = WindowsApiFunctions.GetWindowHandles();

            cboWindows.Tag = windows.OrderBy(i => i.ProcessName).ToArray();
            foreach (var window in (WindowHandle[])cboWindows.Tag)
            {
                cboWindows.Items.Add(string.Format("{0} - {1}", window.ProcessName, window.Title));
            }
        }
        private void elementTree_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (e.Node.Tag == null)
            {
                return;
            }
            var element = ((Element)e.Node.Tag);

            if (element.Picture == null)
            {
                element.Picture      = WindowsApiFunctions.CaptureElement(GetSelectedWindowHandle().Handle, element);
                elementPicture.Image = null;
                elementPicture.Refresh();
                elementPicture.Image = element.Picture;
                elementPicture.Refresh();
            }
        }