Override form control Lookup using extensions

Expand controll Events node and right click on OnLookup and select Copy event handlr method.
To supress standard lookup method and following warning message:
More than one form was opened at once for the lookup control.
Use following code:
        FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;
        ce.CancelSuperCall();
Full lookup method:
    [FormControlEventHandler(formControlStr(AssetParameters, VKInterfacesGroup_VKFixedAssetJournalNameId), FormControlEventType::Lookup)]
    public static void VKInterfacesGroup_VKFixedAssetJournalNameId_OnLookup(FormControl sender, FormControlEventArgs e)
    {
        Query query = new Query();
        QueryBuildDataSource queryBuildDataSource;
        QueryBuildRange queryBuildRange;
    
        SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(InventJournalName), sender);
    
        sysTableLookup.addLookupField(fieldNum(InventJournalName, JournalNameId));
        sysTableLookup.addLookupField(fieldNum(InventJournalName, Description));
    
        queryBuildDataSource = query.addDataSource(tableNum(InventJournalName));
    
        queryBuildRange = queryBuildDataSource.addRange(fieldNum(InventJournalName, JournalType));
        queryBuildRange.value(SysQuery::value(InventJournalType::Asset));
    
        sysTableLookup.parmQuery(query);
    
        sysTableLookup.performFormLookup();

        FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;
        ce.CancelSuperCall();
    }


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