#define OLD_PROC_KEY "oldwindowproc"
...

 if (GetProp( hWnd, OLD_PROC_KEY )== 0 )
    {
        hFuncPtr = SetWindowLong( hWnd, GWL_WNDPROC, (DWORD)NewWndProc );
        sprintf(s,"hFuncPtr %x hWnd %x",hFuncPtr,hWnd);
	    logs(s);
        SetProp( hWnd, OLD_PROC_KEY, (HANDLE)hFuncPtr );
        
    }

......
static LRESULT APIENTRY NewWndProc(
	HWND hWnd,
	UINT uMsg,
	WPARAM wParam,
	LPARAM lParam)
{  	     
     
     
    switch(uMsg)
    {
    	case WM_ACTIVATE: {
    	logs("!!!!!!!!WM_ACTIVATE"); //Здесь не ловится.
    	break;
    	}
    	 
		case WM_PARENTNOTIFY: { //Ловится
			
			
			if (wParam == WM_CREATE) {
				RECT rect;
				HWND hChild = (HWND) lParam;
	   		   	childId = hChild;
	   		   	SetLastError ( 0 );
	   		   	logs("wParam == WM_CREATE");
	   		break;
		}
		
		
		case WM_SIZE: {  // тоже ловится
			logs("WM_SIZE!!!!");
			WORD newHeight = HIWORD(lParam);
			WORD newWidth = LOWORD(lParam);
			HWND hChild = GetWindow(hWnd, GW_CHILD);

			if (hChild != NULL) {
				SetWindowPos(hChild, NULL,  0 ,  0 , newWidth, newHeight, SWP_NOZORDER);
			}
			break;
		}
		
    }

	return CallWindowProc(GetProp(hWnd, OLD_PROC_KEY),
						  hWnd, uMsg, wParam, lParam);
}

case WM_ACTIVATE: {
    	logs("!!!!!!!!WM_ACTIVATE"); //Здесь не ловится.
    	break;
    	}