If you have not already done so, insert a grid into your display. How?
If you have not already done so, add the data source. How?
On the Columns tab, select the column you want to set enumeration for.
On the Enumeration tab, clear the Use Default Column Settings check box and select the Enable ColumnEnum check box.
Select the Data Bound or Manually option depending on whether you want the list of values to come directly from the original data source (e.g. from an SQL statement) or whether you want to enter the values (strings) manually.
If you selected the Data Bound option, click the Configure Data Source button and select the required source/column.
If you selected the Manually option, click the Add Strings button and enter the values you want to appear in the drop-down list.