Remove rows from picker

I want to show picker values based on selection of above field in form. For that purpose I need to remove picker rows and populate the new values.

For IOS below code is working but for its throwing exception. Any idea?

var _col = $.pickerType.columns[0];
for (var r=_col.rowCount-1; (r >= 0); r--)
 _col.removeRow(_col.rows[r]);
 
var results = response.msg.resultSet;
var resultsLength = results.length;
var data_type =[];
 
for(var i=0; i< resultsLength; i++){
data_type.push(Titanium.UI.createPickerRow({id : results[i].accountCode, title : results[i].accountType }));}       
 
$.pickerType.add(data_type);