Combination Text-List Control (Control Type)

Order the items in the list box in some application-defined way that is meaningful to the user, such as alphabetically, numerically, chronologically, or other such order.

Use either a single or a browse selection model in the list box.

Use the browse selection model in the list box if a text-entry field is used and the list box cannot take focus.

Use the browse selection model in the list box if prefix completion is in use.

Move input focus to the text field if the user presses the SELECT button on an item in the list box and the list box cannot take focus. The item indicated is selected as usual, however.

If the user presses ↓ when focus is in the text field and the list box is not displayed, do one of the following:

If the user presses keys used for vertical navigation or paging when focus is in the text field and the list is not displayed, do one of the following:

If the user presses a key used for vertical navigation or paging when focus is in the text field and the list box is displayed, navigate in the list as indicated, select the cursored list item, and display it in the text field.

A combination text-list control whose list box cannot take focus is a tab group.

When focus is in a text-list control whose list box is temporarily displayed and keyboard navigation (for example, tab group or window navigation) is used to move the focus elsewhere, the list box is removed if currently displayed.

When a text-entry field in a combination text-list control has focus, input of printing characters enters them into the text field, with or without prefix navigation.

When a list item is selected, other than by prefix navigation, place the text of the newly selected list item in the text field.

When a newly selected list item is placed in the text field and is selected in the text field, place the cursor at the end of the text field.

Provide vertical scroll bars if some of the items in the list box are not displayed when the list box is displayed.

Make the text field at least as wide as the list box would be if it were displayed.

If the list box is not always displayed, include a list cascade element from which the list box can be displayed.