SSRS Cascading Parameter Setting Default Value of Parameter by Expression

Hi All,
I need some help on an issue I am running into in SQL server 2008 report parameters. I have the following Report Parameters defined:
1) @PredefinedDateSelection - Boolean (User Selectable True/False, Default Value - 'False')
2) @StartDate - Text (User input text box)
If @PredefinedDateSelection = TRUE, then I would like to provide a particular default value to the StartDate textbox (i.e. @StartDate Default Value), If @PredefinedDateSelection = FALSE, then I would like to provide a different default value.
I have the following code for the Expression for the Default value of @StartDate: =code.GetStartDate(Parameters!PreDefinedTimeSelection.Value)
where GetStartDate is a very simple VB function defined as :
Public Function GetStartDate(x as boolean ) As String
Dim a as string
Dim b as string
a = "Report Uses Predefined Values"
b = "Please Input Value"
If (x) then
Return a
else
Return b
end if
end function.
Now the default value of @StartDate stays set as "Please Input Value", and does not change when I toggle @PredefinedDateSelection from False to True and vice versa. I was expecting to see the Default value to change between the two messages depending on my selection in the report preview.
Another parameter which is a dropdown and uses a dataset to display two different set of selectable items depending on the value of @PredefinedDateSelection is working just fine. I am not sure if I am missing something or I am doing something wrong.
Instead of using the VB code I also tried : =iif(Parameters!PreDefinedTimeSelection.Value = True,"Report Uses Predefined Values","Please Input Value")
I also tried changing the default value using a dataset with SQL query and the available value set to NONE, so that the user could input. But the Default value does not refresh or change values.
I hope I have explained my question clearly. I would really appreciate any thoughts and comments.
Thanks,
Arunesh

Thank you much for your response.
I tried that and it did work. But my requirement is to have a user input the date. The basic idea is if the user decides on a predefined time range like Day Shift Today or Yesterday and so on... then the report would automatically calculate the values based on predefined date time values. On the other hand, if the intent is to run the report for an arbitrary period then the user supplies the date and time limits.
What I am trying to achieve is have the same parameter available for user input , but when the User decides he wants Predefined then the "textbox" populates with date and time as per his choice of predefind range.
I understand that by this the user can still overwrite the date and time on the text box, but the report will run the predefined values as long as he has the @PredefinedDateSelection Set to true.
Is there a way I can impement this?
Once again I thank you and appreciate your input.

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