Override method at runtime. Form/Dialog control.

Example in context of Dialog. But can be done for any form control at runtime:
public Object dialog()
{
    DialogRunbase       dialog = super();

    dlgInventLocationId = dialog.addFieldValue(extendedTypeStr(InventLocationId), inventLocationIdFrom);
    dlgInventLocationId.registerOverrideMethod(methodStr(FormStringControl, lookup), methodStr(WHBaseConfiguration, inventLocation_lookup), this);

    return dialog;
}
Example of lookup method:
private void inventLocation_lookup(FormStringControl control)
{
    SysTableLookup          sysTableLookup;
    QueryBuildDataSource    queryBuildDataSource;
    Query                   query = new Query();

    queryBuildDataSource = query.addDataSource(tablenum(InventLocation));
    queryBuildDataSource.addRange(fieldNum(InventLocation, WHSEnabled)).value(queryValue(NoYes::Yes));
    queryBuildDataSource.addRange(fieldNum(InventLocation, FSHStore)).value(queryValue(NoYes::Yes));
    queryBuildDataSource.addRange(fieldNum(InventLocation, InventLocationId)).value(SysQuery::valueNot(inventLocationIdTo));

    sysTableLookup = SysTableLookup::newParameters(tablenum(InventLocation), control);
    sysTableLookup.addLookupfield(fieldnum(InventLocation, InventLocationId),  true);
    sysTableLookup.addLookupfield(fieldnum(InventLocation, Name));
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}

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