Occurs before each group item is displayed. You can create the actual content of each item and return the value. The Control property container a [Level] property that contains a zero-based index of the level of the header

form: pf.Form

args: pf.IListBoxGroupItemEventArgs

where pf.IListBoxGroupItemEventArgs:

export interface IListBoxGroupItemEventArgs {

Sender: any;

Control: any;

DataItem: any; FieldName: string;

GroupName: string;

GroupCode: string;

}

any