dialog in Series 60

Hi all
please give me some tips about dialogs in the series 60 ?
do dialogs always come in a Form ?
if not , how do I create a dialog ?
for now , I try to create a dialog in a form , and use the code below , but I get a break point ,
Please advise cause I'm new to Series 60 ,
Thanks in advance

**** CPP FILE ****
CAknForm * form = new( ELeave ) CAknForm;
CleanupStack::PushL(form);
form->ConstructL();
CleanupStack::Pop();
form->ExecuteLD(R_MYAPP_ABOUT_DIALOG);
**** RSS file ****
RESOURCE DIALOG r_myapp_about_dialog
    {
    flags = EEikDialogFlagWait | EEikDialogFlagNoDrag;
    buttons = R_AVKON_SOFTKEYS_OPTIONS_BACK;
    form = r_myapp_about_form;
    }
RESOURCE FORM r_myapp_about_form
	{
	items=
		{
		DLG_LINE 
			{ 
			type=EEikCtLabel; 
			id=EcelCallControlIdAbout; 
			control=LABEL{txt="MyApp version 1.0";};
			}
		};
	}