TableTools and select boxes

Hi,

I have a question about Datatables in combination with TableTools:

In some columns of a table, I'm using 'mRender' to display the data as 'select boxes' (dropdown). The reason why I'm doing that, is that it allows users to edit the table, but they can't enter invalid values, since the select boxes only allow predefined values.

Before instantiating the oTable object, I build the value of "aoColumnDefs" (containing 'mRender') the following way:

(...)
// pre-build the list of options of the select box
for (var j=0; j<iNumberOfOptions; j++)
   {
   var sSelectOptionValue = aSelectBoxValues[j];
   sSelectOptions += "<option value=\""+sSelectOptionValue+"\">"+sSelectOptionValue+"</option>";
   }

// aColProps will be given as a value of "aoColumnDefs" in  oTable  later on
aColProps.push( { 
   "mData": sNameOfCurrentColumn, 
   "aTargets": [ i ],
   "mRender": function ( data, type, full ) {	
					
   // return the select box with the right option selected
   return "<center>"+
   "<select>"+ 
   // preselect the current value of this cell by adding selected attribute
   sSelectOptions.replace('option value="'+data+'"', 'option value="'+data+'" selected')+
   "</select>"+
   "</center>";
					
   },
// etc etc
(...)

This is working very well.

But: when exporting the table with TableTools (as csv or pdf, whatever), the cells containing select boxes show not only their selected values, but all the possible options of the select, concatenated as one string.
So if the select box has the options "OK", "NOT_OK", "WHATEVER", and "OK" is the selected value, the table on my screen shows a select box with "OK" selected (which is correct), but when exporting this table with TableTools, the exported csv or pdf file shows the same cell now like "OKNOT_OKWHATEVER" (not correct)...

Do you have any idea how to solve that?

(I'm using Datatables 1.9.4 and TableTools 2.1.5.)