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win32 - using the WM_MENUSELECT message

Cambalinho (1445)
i'm trying use the WM_MENUSELECT message for get mouse leave and mouse enter.
for mouse enter i use:
if(((HIWORD(wParam) & MF_HILITE) || (HIWORD(wParam) & MF_MOUSESELECT)) && GetMenuState((HMENU)lParam,LOWORD(wParam),MF_BYCOMMAND)!=0xFFFFFFFF)
these code works fine.
but see these code:
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if(((HIWORD(wParam) & MF_HILITE) || (HIWORD(wParam) & MF_MOUSESELECT)) && GetMenuState((HMENU)lParam,LOWORD(wParam),MF_BYCOMMAND)!=0xFFFFFFFF)
                    {
//without the before 'if' the next code works, else is ignored :(
                        //Mouse Enter
                        Last_Menu_ID = LOWORD(wParam);
                        MENUITEMINFO menuInfo;
                        menuInfo.cbSize = sizeof(MENUITEMINFO);
                        menuInfo.fMask=MIIM_DATA;
                        GetMenuItemInfo((HMENU)lParam,Last_Menu_ID, FALSE, &menuInfo );
                        Menu *mMenu = (Menu *) menuInfo.dwItemData;
                        if (mMenu!=NULL)
                        {
                            mMenu->Enter();
                        }
                    }

the mouse enter is done without a problem.
now i added these 'if':
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if(((HIWORD(wParam) & MF_HILITE) || (HIWORD(wParam) & MF_MOUSESELECT)) && GetMenuState((HMENU)lParam,LOWORD(wParam),MF_BYCOMMAND)!=0xFFFFFFFF)
                    {
                        if(Last_Menu_ID!=-1 && Last_Menu_ID != LOWORD(wParam))
                        {
                            MENUITEMINFO menuInfo;
                            menuInfo.cbSize = sizeof(MENUITEMINFO);
                            menuInfo.fMask=MIIM_DATA;
                            GetMenuItemInfo((HMENU)lParam,Last_Menu_ID, FALSE, &menuInfo );
                            Menu *mMenu = (Menu *) menuInfo.dwItemData;
                            if (mMenu!=NULL)
                            {
                                mMenu->Leave();
                            }
                        }
                        //without the before 'if' the next code works, else is ignored :(
                        //Mouse Enter
                        Last_Menu_ID = LOWORD(wParam);
                        MENUITEMINFO menuInfo;
                        menuInfo.cbSize = sizeof(MENUITEMINFO);
                        menuInfo.fMask=MIIM_DATA;
                        GetMenuItemInfo((HMENU)lParam,Last_Menu_ID, FALSE, &menuInfo );
                        Menu *mMenu = (Menu *) menuInfo.dwItemData;
                        if (mMenu!=NULL)
                        {
                            mMenu->Enter();
                        }
                    }

how these 'if' can affect the 'mouse enter' been ignored or not?
i'm confused :(
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