code.cs

private void MaskDataColumnNames(dynamic data)
{
    // flatten data object in case of an array
    if (data.GetType() == typeof(JArray))
        data = data[0];

    // find merge fields ribbon menu button
    RibbonMenuButton ctlInsertMergeFields =
        ribbonReportingTab1.FindItem(
            RibbonReportingTab.RibbonItem.TXITEM_InsertMergeField)
            as RibbonMenuButton;

    // get the selected master table info
    DataTableInfo dataTableInfo =
        ribbonReportingTab1.DataSourceManager.MasterDataTableInfo;

    // select token in data object
    if (dataTableInfo.TableName != "RootTable")
    {
        data = data.SelectToken("$.." + dataTableInfo.TableName);
    }

    // change the strings
    ApplyMaskedString(ctlInsertMergeFields.DropDownItems, data);           
}