Show and Hide RadComboBox

[nav100]

Hi,
I am trying to hide and show RadComboBox. 
But this code doesn't seem to be working. I checked in IE and FireFox. Thank you.





$.ajax({  
            url: applicationPath + "/test/Test.svc/GetResultById",  
            type: "POST",  
            dataType: "json",  
            data: '{"sId":' + sender.get_value() + '}',  
            contentType: "application/json; charset=utf-8",  
            success: function(result)  
             {  
                  var combo = "<%= RadComboBox1.ClientID %>"); 
 
                  if(result.d == false)  
                  {  
 
                    combo.hideDropDown();  
                  }  
                  else 
                  { 
                    combo.showDropDown(); 
                  } 
             }        

[nav100]

It's working with

combo.set_visible(

false);

Thanks..