change delimiter in ssrs multi select combobox

Hii all ,

question i am going to ask is about to customize a ssrs control .. 

I want to customize a multiple selction combobox as all know it is passing a bunch of values in CSV format like comma

seperated string '1,2,3' now 

the reason to customize this to is ..

i have a multiselect combobox  to select multiple categoty which is loads from my master data table of SQL server 

list is : BG-EPCG , CEL , Term Loan - Construction , Land & Building etc

now as above 3rd one has comma in between the strings and when this list is selected it is passing as 

'Term Loan - Construction, Land & Building' ie two string to search in store procedure 

what can i do for this any workaround please suggest me..

i cant change my list name in master it is fixed 

any solution i have to try ssrs side or store procedure  side ..

please help ..

Dilip Patil..