How to enable/disable parameters(automatically) based on another parameter? VS 2005

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VS2005

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Hello Friends,

I am not sure if this is doable in SSRS 2005 but I have below mentioned scenario and need your help.

I have three parameters "p1", "p2" and "p3" and three of them have a default null value.

Now.. If I uncheck null from @p1 parameter, I want the p2 and p3 parameter to have the default NULL value checked and if @p1 parameter is set to null meaning if the NULL checkbox for p1 is checked, I want the p2 and p3 parameters to uncheck.

I tried to set the default value via the expression and I also create a separate dataset to set the default values but I received an error stating that "forward dependencies are not valid"

I am using VS2005. Please help. Thanks in advance :)