I think you have to use the bold parameter
this is from QlikView help
getfieldselections ( FieldName [, ValueSep [, MaxValues [, State]]])
Returns a string with the current selections in a field. It is possible to query an alternate state.
ValueSep is the separator to be put between field values. The default is ', '.
Maxvalues is the maximum number of field values to be individually listed. When a larger number of values is selected the format 'x of y values' will be used instead. The default is 6.