How to add custom dialog for installshield

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My question is related with InstallShield. I am trying to provid support adding one more dialog in my project. So I would need any tutorials or step by steps to add custom dialog.

It would be more helpful to share the information.

My advance thanks!!!!

What I have tried:

1. I am creating one custom dialog, User Interface -> Dialogs -> New Dialog.
2. I keep one Listbox and push button in my dialog.
3. I have created method like below :- 

#include "Sdint.h"
#include "Str.h"
#include "CustomDlg.h"
#include "Winapi.h"
#include "Misc.h"
#include "DialogsPriv.h"
#include "Sdrc.h"

//private constants
#define DLG_FINISHERRORSUMMARY "FinishWithErrorSummary" //My Custom Dialog Name
#define DLG_FINISHERRORSUMMARY_ID 1431 //Dialog ID
#define FINISHBUTTON_ID 1304
#define LISTBOXERROR_ID 1302

//private globals

prototype FinishErrorSummary();

function FinishErrorSummary()
NUMBER nOptions, nControl, nReturn, nResult;
BOOL bDone, bChecked;
HWND hwndDlg, hItem;
LIST listString;
begin

listString = ListCreate(STRINGLIST);
ListAddString(listString, "Monday", AFTER);
ListAddString(listString, "Wednesday", AFTER);
ListAddString(listString, "Friday", AFTER);

nResult = EzDefineDialog("DLG_FINISHERRORSUMMARY", ISUSER, "", 1431); 

if (nResult < 0) then
// Report an error; then terminate.
MessageBox ("Error in defining dialog", SEVERE);
abort;
endif;

// Loop in dialog until the user selects a standard button
bDone = FALSE;

while (!bDone)
nControl = WaitOnDialog("DLG_FINISHERRORSUMMARY");
switch (nControl)
case DLG_INIT:
// Initialize the back, next, and cancel button enable/disable
// states for this dialog and replace %P, %VS, %VI with
// IFX_PRODUCT_DISPLAY_NAME, IFX_PRODUCT_DISPLAY_VERSION, and
// IFX_INSTALLED_DISPLAY_VERSION, respectively, on control IDs 700-724 and 202.
hwndDlg = CmdGetHwndDlg("DLG_FINISHERRORSUMMARY"); 
SdGeneralInit("DLG_FINISHERRORSUMMARY", hwndDlg, 0, ""); 

CtrlSetList("DLG_FINISHERRORSUMMARY", 1302, listString); 
bDone = TRUE; 

case DLG_ERR:
nControl = ISERR_GEN_FAILURE;
bDone = TRUE;
SdError(nControl, DLG_FINISHERRORSUMMARY);

case DLG_CLOSE:
SdCloseDlg(hwndDlg, nControl, bDone); 

default:
// check standard control handling
if (SdIsStdButton(nControl) && SdDoStdButton(nControl)) then
bDone = TRUE;
endif;

endswitch;
endwhile;
EndDialog(DLG_FINISHERRORSUMMARY);
ReleaseDialog(DLG_FINISHERRORSUMMARY); 

end;

4. Calling this method from OnFirstUIAfter() like below 
nResult = FinishErrorSummary(); 
if (nResult = 0) then 
SetDialogTitle (DLG_ASK_OPTIONS, szTitle); 
endif;


5. Responses for the above custom functions mentioned below:
i) nResult = EzDefineDialog("DLG_FINISHERRORSUMMARY", ISUSER, "", 1431); 
nResult I am getting the value as '0'. Hope this is right response.

ii) nControl = WaitOnDialog("DLG_FINISHERRORSUMMARY");
nControl I am getting the value as '-100'. Hope this too right response.

Issue:
But the custom dialog not getting display.

Please let me know if anything I missed out here. It would be more helpful.....

Help me!!! Help me!!! Help me!!!