Hi AliR, I am developing a MFC DLL project. I don't know how to catch TCN_SELCHANGE notification. Could you give me some ideas? David AliR wrote: TabCtrl_GetCurSel(hWnd) is a the same as SendMessage(hWnd,TCM_GETCURSEL,0,0); I saw that you are creating the tab and adding items to it. In the code that you have posted (assuming that this is all in the same function) the

Hi AliR, I am sorry. the code is like this: (1) create the tab control hwndTabCtrl=CreateWindow (WC_TABCONTROL,"",WS_CHILD|WS_CLIPSIBLINGS|WS_VISIBLE,0,0,rcClient.right,rcClient.bottom,hwndParent,NULL,g_hinst,NULL); if(hwndTabCtrl==NULL) AfxMessageBox("can't create tab control window"); (2) create three dialogs pDialog[0]=new CPartDlg(); pDialog[0]->Create

Thanks,AliR. I modify my codes according to your suggestion. but there still the same problem.What I want is like this: when I select the first page,one dialog is shown up(not automatically) and when I select the second page the other dialog is up. because I use DLL, it is not easy to process the message TCN_SELCHANGE. i use the macro TabCtrl_GetCurSel(), but I don't know why the return value