Hi,
For the combo box with display values with special characters, row Selection does not work Exemple: 
It's not possible to select Test &, i tried to replace "&" by: Escape sequence, HTML numeric code and HTML named code, nothing worked.
Found problem at the this.handleSelectedComboItem:
if (Encoder.htmlEncode(rowData[i][fieldName]) === comboVal) {
ThingWorx 8.3.1-b441
Best Regards,
Ana Duarte.