I want to open Microsoft Security Essential program and click Scan now button with VC . I can find window but Can't find control. This is my code when I run this code it show Control not found . I try to test this code with click Browse button in Run program it work but when I try to use with Microsoft Security Essential it not found control. I don't know why maybe this control is in Tab . How to use FindWindowEx() click Scan now button in Microsoft Security Essential ?