Date Parameters Show As Strings When Using Analysis Services As A Data Source

We have been a Crystal shop for ages; we are currently doing a proof-of-concept for a conversion to MS Reporting Services. As such, we are developing some Analysis Services 2005 cubes to drive some new SSRS reports, which our users will access through Report Manager. Unfortunately, we are all MDX noobs here, so we are making heavy use of the Wizards until we can come up to speed.



The problem we are running into is when we develop a report with Date Parameters. When we deploy this report, the date parameter box is a dropdown box instead of a date picker. I've seen a couple of other posts on this topic, but when I try to apply the fixes mentioned in them, I throw errors.



I have two quick questions:

Why does this happen? Is it a limitation in the MDX language, in SSAS, or SSRS? Are there any planned fixes?
Can someone please show me how to fix this on my actual query string for one of our basic reports? I've highlighted the date parameters.




Code Snippet

SELECT NON EMPTY { [Measures].[Lead] } ON COLUMNS, NON EMPTY { ([Store].[Store ID].[Store ID].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS FROM ( SELECT ( STRTOSET(@LeadSourceTypeLeadSourceType, CONSTRAINED) ) ON COLUMNS FROM ( SELECT ( STRTOSET(@StoreStoreID, CONSTRAINED) ) ON COLUMNS FROM ( SELECT ( STRTOMEMBER(@FromLeadCreationDateCalendarDate, CONSTRAINED) : STRTOMEMBER(@ToLeadCreationDateCalendarDate, CONSTRAINED) ) ON COLUMNS FROM [Referral Leads]))) WHERE ( IIF( STRTOSET(@LeadSourceTypeLeadSourceType, CONSTRAINED).Count = 1, STRTOSET(@LeadSourceTypeLeadSourceType, CONSTRAINED), [Lead Source Type].[Lead Source Type].currentmember ) ) CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS



I'm afraid, given my user community, that if I can't get the date picker to work properly, it could be a deal breaker.



Thanks very much in advance for your help.



Regards,



Steve