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This feature is a powerful enhancement for the listbox object, providing you with a mean to define very flexible UIs. An array of objects can now be associated with the column of a listbox so that each cell can have different types of widgets according to the type of data to be displayed.
For example, you could insert a text input in the first row, a check box in the second, and a drop-down list in the third. Object arrays also provide access to new kinds of widgets, such as buttons or color pickers.
For more details, we invite you to take a look at the Using object arrays in listbox columns article in the 4D v15 Language Reference manual in Doc Center.