primaryKey

This property is recognized only by the SortingTable container. The SortingTable container organizes components into a table with each column expected to contain components of the same class. SortingTable allows the rows to be sorted according to the values in any column. Typically, the sort order is determined from the value of each component in the column. There may be cases, however, where the value of the component is not suitable for sorting or may be inefficient to compare. In these cases, you can specify an alternate numeric sorting key.