Hi I have a question, I'm working on a MFC assigment and I encountered on a problem,and fixed it after spending houres searching the internet and thinking . Here is what the problem was, my project was working fine but when I would close it a run time check error ocures saying "stack around InitCtrls variable was corrupted", variable InitCtrls is defined 1. INITCOMMONCONTROLSEX InitCtrls; 2. InitCtrls.dwSize = sizeof(InitCtrls); 3. InitCtrls.dwICC = ICC_STANDARD_CLASSES; 4. InitCommonControlsEx(&InitCtrls); Now I know that when this error ocures that there isn't enough memory for some variable example: int a; a=25; //stack over variable a corrupted In my problem the line 3. was defined like this InitCtrls.dwICC =ICC_WIN95_CLASSES; and when I changed it to InitCtrls.dwICC = ICC_STANDARD_CLASSES; the problem was fixed. Finnaly my question is how does changing the code in line 3. relate with the simple example showed above? what do ICC_WIN95_CLASSES,ICC_STANDARD_CLASSES mean?