Hello Rajeshwaran,

Thank you for your query. It has been submitted as a bug request, but I believe this might be more of a misunderstanding than an actual issue.

It seems that since the screenshot is capturing the main application, the dialog might not be located correctly. Please ensure that the correct dialog is located before proceeding with the capture. Note that a WPF dialog (e.g., a popup dialog) is usually launched as a child or secondary window of the main application. It is often treated as a standalone Window element, but it is still part of the application's logical UI tree.

Based on your screenshots, I have developed a sample WPF application.

Here is the code I used to capture an image of the dialog:

WpfWindow dialog = Manager.ActiveApplication.GetWindow("PopupDialog");
Bitmap dialogImage = dialog.Capture();
string filePath = System.IO.Path.Combine("C:\\Temp", "CapturedImage.png");
dialogImage.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);

Notice the first line of the code snippet where the popup dialog is located. I assume the confusion arises if you are using Manager.ActiveApplication.MainWindow in your implementation, which would result in capturing a screenshot of the main application instead of the dialog.

Please ensure you are locating the correct dialog window before capturing the image.

If you need further assistance, feel free to reach out.

Regards,
Ivaylo
Progress Telerik