MVG Primary Selector Control of the Forms File
If you set the class attribute of the control tag to mvg_primary_selector, then you must specify the following tags in the control tag:
source. Behavior is similar to the lookup control. The source tag includes the following attributes:
type. Defines the many-to-many association ID that Siebel CRM Desktop uses for this control.
linking_field. Contains the field name of this association where the ID of the parent object is saved.
flag_field. Contains the field name that Siebel CRM Desktop uses to set the primary flag.
display_format. Defines the output mask.