How add drop down list to spatial reference parameters of "Make XY Event Layer" tool?

Discussion created by anjelinapon on Dec 3, 2013
Latest reply on Dec 3, 2013 by anjelinapon
I,m using "Make XY Event Layer", I need to add a drop down list to spatial reference parameter. for example if xy file of a user is in UTM, the user select UTM, if it's xy file is in Lambert, he select lambert from drop down list.
There is not any solution for solving this problem. In model builder we can just select 1 coordinate system and when a client use this tool he enconter with 1 option like this:

PROJCS['WGS_1984_UTM_Zone_38N',GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',500000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',45.0],PARAMETER['Scale_Factor',0.9996],PARAMETER['Latitude_Of_Origin',0.0],UNIT['Meter',1.0]];-5120900 -9998100 10000;-100000 10000;-100000 10000;0.001;0.001;0.001;IsHighPrecision

What should I do?