How to Hide the dialog field depends on menuitem for SSRS report with SysOperation Framework

Hi, Experts:

I'm using AX 2012 CU7 and just learn to develop SSRS report.

Any suggestion would be truly appreciated.

Here is the scenario:

I have 2 menu item, M1, M2 both point to same SSRS report controller, which is generated by SysOperation framework.

How to hide some fields and set it to a default value if I click M2. (for example: a checkbox)

Can I do it by overriding some methods in UIBuilder class or can I just set up 2 contract classes for this scenario?

Quatrani