How we can add custom Lookup on Morphx Report Dialog Box?

Basically, my requirement is like these.   I have a Morphx repoprt when we open these report , a dialog box will open. Which have Four field 

a) From Date          b) To Date        c) Customer Group       d) Customer Account

Basically, i want when we select Customer Group (For ex. 10 ), so only customer which are under these customer group are shown in Customer Account Field........ Please remember i want these customization only on Morphx report. In SSRS Report  or Excel Report i achieved these customization.........................

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