Thanks for using Syncfusion Products.
We have prepared a customization sample for ReportDesigner, it can be downloaded from the following location.
We are currently working on the Source code add-on setup. Our Essential Studio 2013 volumn 4 Source code add-on setup will available to download on 23rd December 2013 and you can modify your custom code.
Please let us know if you have any questions.
Sorry about the inconvenience caused.
In our previous update we wrongly provided the sample (missing some files while compression) . We have included the proper compressed sample file and it can be downloaded from the below location.
If you still face any issues please create direct trac incident with your sample application. We will get back to you with much more details through the incident.
Please let us know if you have any concerns.