Form controls belong to one of three groups, depending on their data source as follows:

• ·         Bound control – associated with a field in an underlying table. Use bound controls to display, enter, and update values from fields in the database.
• ·         Unbound control – does not have a data source. Use unbound controls to display pictures and static text.
• ·         Calculated controls – uses a method as the data source. An example of a calculated control is the sum of two fields on a form.

 Example for Unbound Control

—->Here roles(Purpose) is a StringEdit control in the form. For this control, we should get the Drop down for selecting the Purpose

—-> Here the data we r getting from the lookup is not from the Datasource,that’s y we call this control as UNBOUND Controls

 SysLookupMultiSelectCtrl   rolesCtrl;

rolesCtrl = SysLookupMultiSelectCtrl::construct(element, roles, queryStr(LogisticsLocationRolePostalLookup), true, [tableNum(LogisticsLocationRoleTranslation), fieldNum(LogisticsLocationRoleTranslation, Description)]);