TDBDropDown at Design Time

Since the TDBDropDown control is a subset of TDBGrid, the two controls have many properties in common and are similar to work with at design time. There are two major differences, however, due to the reduced functionality and user interface of TDBDropDown.

First, TDBDropDown does not support multiple splits. Therefore, it does not have a Splits collection, which means that:

There is no Splits property page. Properties that still make sense for a single-split control, such as ScrollBars, were moved to the General property page.
The visual editing menu commands Split and Remove were removed.
You cannot create a new split interactively in visual editing mode.

Second, TDBDropDown does not support cell editing. Therefore, the following features are no longer accessible from the property pages:

In-cell buttons.
Some ValueItems properties, such as CycleOnClick and Validate.
User permission properties, such as AllowAddNew, AllowDelete, and AllowUpdate.