Result = CreateDialog(#Dialog)Description
Create a new uninitialized dialog. To initialize the dialog, use OpenXMLDialog().
#Dialog A number to identify the new dialog. #PB_Any can be used to auto-generate this number.
Returns nonzero if the dialog was created successfully and zero if not. If #PB_Any was used as the #Dialog parameter, then the auto-generated number is returned in case of success.