TDBToDoList adding dropdown list

For the DBToDoList how can I add a dropdown list to a column (such as Resource) instead of just free text entry? I notice there is no picklist property as in DBGrid.

Also how is the Category column used? When I add it and click on it, it just shows a line at the top of the cell.

For the tdResource column type, this is right-now implemented as a text editor only. There is not currently an option to have a dropdown list editor for this type.
For the tdCategory type, please specify the categories to choose from via the stringlist TodoList.Category