Who has used visifire control?How to set the linechart's x-axis data type is a string type?Open source code has date, datetime, auto, but not the string?

#region 程序集 SLVisifire.Charts.dll, v2.0.50727
// E:\Visifire\SLVisifire.Charts.dll
#endregionusing 
System;namespace Visifire.Charts{   
 public enum ChartValueTypes    {        
    Auto = 0,          
  Numeric = 1,       
     Date = 2,         
   DateTime = 3,       
     Time = 4,    }}