Thread: Tab Controls

Hello,
I have problem in having a tab control created with Win32 programming working properly. Though the contrl is created, but on clicking any of the tabs none of the others controls created did not show on the tab control.

Here is the code for the tab control:

Code:

 BOOL SetUpMDIChild1WindowClass(HINSTANCE hInstance)
        {
                WNDCLASSEX wc;

                wc.cbSize = sizeof(WNDCLASSEX);
                wc.style = CS_HREDRAW | CS_VREDRAW;
                wc.lpfnWndProc = MDIChild1WndProc;
                wc.cbClsExtra = 0;
                wc.cbWndExtra = 0;
                wc.hInstance = hInstance;
                wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
                wc.hCursor = LoadCursor(NULL, IDC_ARROW);
                wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
                wc.lpszMenuName = NULL;
                wc.lpszClassName = g_szChild1ClassName;
                wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

				

                if(!RegisterClassEx(&wc))
                {
                MessageBox(0, "Could Not Register Child Window", "Oh Oh...",
                MB_ICONEXCLAMATION | MB_OK);
                return FALSE;
                }
                else
                return TRUE;
        }

LRESULT CALLBACK MDIChild1WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
        {
	int i;
	HFONT hfDefault;
	NMHDR lpnmhdr;
	lpnmhdr.hwndFrom = g_hwndTab;
	lpnmhdr.idFrom = IDC_TABCTRL;
	switch(msg)
	{
		case WM_CREATE:
		{
			
                         //Create Tab Controls
                              g_hwndTab = DoCreateTabControl(hwnd);

		//Create Static Control that will occupy the tabcontrol's display area.
		     g_hwndDisplay = DoCreateDisplayWindow(hwnd);
			
	        //Create Edit control that will occupy the tabcontrol's display area. 
				hEditTab = DoEditCreation(hwnd);
			
		}
		break;
		case WM_MDIACTIVATE:
		{
			HMENU hMenu, hFileMenu;
			UINT EnableFlag;

			hMenu = GetMenu(g_hMainWindow);
			if(hwnd == (HWND)lParam)
			{	   //being activated, enable the menus
				EnableFlag = MF_ENABLED;
CheckMenuItem(hSubMenu6,IDM_COYFORMATION,MF_CHECKED |MF_BYCOMMAND);
			}
			else
			{	//being de-activated, gray the menus
				//EnableFlag = MF_GRAYED;
CheckMenuItem(hSubMenu6,IDM_COYFORMATION,MF_UNCHECKED |MF_BYCOMMAND);
			}

			EnableMenuItem(hMenu, 1, MF_BYPOSITION | EnableFlag);
			EnableMenuItem(hMenu, 2, MF_BYPOSITION | EnableFlag);

			hFileMenu = GetSubMenu(hMenu, 0);
			EnableMenuItem(hFileMenu, ID_SAVEAS, MF_BYCOMMAND | EnableFlag);

			EnableMenuItem(hFileMenu, ID_CLOSE, MF_BYCOMMAND | EnableFlag);
			EnableMenuItem(hFileMenu, ID_CLOSEALL, MF_BYCOMMAND | EnableFlag);

			DrawMenuBar(g_hMainWindow);
		}
		break;
		
		
		
		case WM_SIZE: { 
                               HDWP hdwp; 

                                 RECT rc; 
 
                // Calculate the display rectangle, assuming the 
                // tab control is the size of the client area. 
                SetRect(&rc, 0, 0, LOWORD(lParam), HIWORD(lParam)); 
                TabCtrl_AdjustRect(g_hwndTab, FALSE, &rc); 
 
                // Size the tab control to fit the client area. 
                hdwp = BeginDeferWindowPos(2); 
               DeferWindowPos(hdwp, g_hwndTab, NULL, 0, 0, LOWORD(lParam),        HIWORD(lParam), SWP_NOMOVE | SWP_NOZORDER); 
 
                // Position and size the static control to fit the 
                // tab control's display area, and make sure the 
                // static control is in front of the tab control. 
                DeferWindowPos(hdwp, g_hwndDisplay, HWND_TOP, 10, 50, 200, 20,0); 
                DeferWindowPos(hdwp, hEditTab, HWND_TOP, 100, 100, 100, 100, 0);
				EndDeferWindowPos(hdwp); 
            } 
            break; 
 
        case WM_NOTIFY: 
	{
	if(LOWORD(wParam) == IDC_TABCTRL)
	{
	if(HIWORD(wParam) == TCN_SELCHANGE)
	{
		if(SendMessage(g_hwndTab,TCM_GETCURSEL,0,0) == 0)
		{ 
							
		ShowWindow(g_hwndDisplay,SW_SHOW);
		ShowWindow(hEditTab,SW_HIDE);
		}
		if(SendMessage(g_hwndTab,TCM_GETCURSEL,0,0) == 1)
		{
							
		   ShowWindow(g_hwndDisplay,SW_HIDE);
	SetWindowLong(hEditTab,GWL_STYLE,WS_VISIBLE | WS_CHILD  | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL);
							
SendMessage(hEditTab,WM_SHOWWINDOW,TRUE,0);
FORWARD_WM_NOTIFY(hwnd,IDC_TABCTRL,&lpnmhdr,SendMessage);
		}
	}
           }
            
            }
	break; 
	case WM_COMMAND:
	switch(LOWORD(wParam))
	{
		case ID_NEWCOMPANY1:
		break;
	}
	break;

	return DefMDIChildProc(hwnd, msg, wParam, lParam);
	default:
	return DefMDIChildProc(hwnd, msg, wParam, lParam);
	
	}
	return 0;
}

HWND CreateNewMDIChild1(HWND g_hMDIClient)
        {
                MDICREATESTRUCT mcs;
                

                mcs.szTitle = "Company Information";
                mcs.szClass = g_szChild1ClassName;
                mcs.hOwner = GetModuleHandle(NULL);
                mcs.x = 0;
	    mcs.cx = 810;
                mcs.y =  0;
	    mcs.cy = 550;
                mcs.style = MDIS_ALLCHILDSTYLES;

                hChild1 = (HWND)SendMessage(g_hMDIClient, WM_MDICREATE, 0, (LONG)&mcs);

                if(!hChild1)
                        {
                        MessageBox(g_hMDIClient, "MDI Child creation failed.", "Oh Oh...", MB_ICONEXCLAMATION | MB_OK);
                        }
                return hChild1;
        }