This articles describes the Object Picker Control and different use cases of it usage
The purpose ot the control is selecting multiple objects in a simple way, using the type ahead functionality or using powerful browse lookup dialog. The Objects Grid and Object Relation Grid have the same purpose.
Model, the main property of the Control, which accumulates the selected objects. The data type behind model is an array of Guids (ids of the Data Definition objects).
For the rest of the Properties see relating Object Picker control, which has quite the same behavior, with the only difference, it picks a single object only.
How-To: Dynamically add objects to Objects Picker control
The following example demonstrates how the User which been loaded from another Data Source is added to Property bound with the Objects Picker Model, and immediately displayed in control