How to know if a button in a 3rd party app clicked or not

[vinodvinu]

Hi all,
Excuse me if i am posting this question in a wrong forum. I have YTD video downloader in my pc. But it doesn't have a download complete message box. Instead, it will display the download status in it's own listview. But if YTD is minimized, then we never know that download is completed. So i wrote an AutoIt script for checking the download status and alert me when it is finished. Now i need to run this script automatically when i clicked in YTD's "DOWNLOAD" button. Some says that i need to use SetWindowsHookEx. If so, AutoIt has a function named "_WinAPI_SetWindowsHookEx". But there is not much information in the help file. There is one example in help file, but it is related to keyboard hook. So i am seeking help for this. Thanks in advance.