How to refresh current Form when thorugh X++ code influence

when the User actived the Default BOM LAT Price checkbox on price(Purch.) Form,The ERP system will automatic updated and refresh the account selection(Vendor account) to the InventTable Form(have created Relationship field with Primary vendor account) right now.

Such as below.

Wrote by Jimmy on May 5th 2011

public void modifiedField(fieldId _fieldId)
{
    Tec_PrimaryVendor     _PrimaryVendor;
    FormRun               FR;
    InventTable           InventTable;
    InventTableModule     InventTableModule;
    PriceDiscTable        PriceDiscTable,updateThis;
    RecId                 CurRecId = this.RecId;
;
    super(_fieldId);
    switch(_fieldId)
    {
        case fieldnum(PriceDiscTable,QVS_Default) :
             if(this.QVS_Default == Noyes::Yes                 &&
                this.Module      == ModuleInventCustVend::Vend &&
                this.relation    == PriceType::PricePurch      &&
                this.AccountCode == TableGroupAll::Table       &&
                this.ItemCode    == TableGroupAll::Table
                )
             {
                ttsbegin;
                _PrimaryVendor = Tec_PrimaryVendor::find(this.ItemRelation,true);

                if (!_PrimaryVendor)
                {
                    _PrimaryVendor.ItemId = this.ItemRelation;
                    _PrimaryVendor.PrimaryVendorId = this.AccountRelation;
                    _PrimaryVendor.insert();
                }
                else
                {
                    _PrimaryVendor = Tec_PrimaryVendor::find(this.ItemRelation,true);
                    _PrimaryVendor.PrimaryVendorId = this.AccountRelation;
                    _PrimaryVendor.update();

                    //Jimmy 2010-06-10 ++
                    InventTable = InventTable::find(this.ItemRelation,true);
                    if(InventTable)
                    {
                        InventTable.ItemBuyerGroupId = VendTable::find(this.AccountRelation).ItemBuyerGroupId;
                        InventTable.update();
                    }
                    //Jimmy 2010-06-10 --
                }
                ttscommit;

                //Jimmy 2010-06-10 ++
                ttsbegin;
                InventTableModule = InventTableModule::find(this.ItemRelation,ModuleInventPurchSales::Invent,true);
                if(InventTableModule.Price == 0)//if(InventTableModule)////2010-07-27
                {
                    InventTableModule.Price = this.ItemCostPrice_Purch();
                    InventTableModule.update(true);
                }
                ttscommit;
                //Jimmy 2010-06-10 --;

                if(infolog.globalCache().get(FormStr(InventTable),"RefreshCurrentForm"))
               {
                   fr = infolog.globalCache().get(FormStr(InventTable),"RefreshCurrentForm");
                   InventTable = InventTable::find(this.ItemRelation);

                   fr.dataSource("InventTable").reread();
                   fr.dataSource("InventTable").research();
                   fr.dataSource("InventTable").refresh();
                   fr.dataSource("InventTable").findRecord(InventTable);
               }

            }
            else
            {
                select firstonly PriceDiscTable
                    where PriceDiscTable.QVS_Default == Noyes::Yes           &&
                    PriceDiscTable.Module      == ModuleInventCustVend::Vend &&
                    PriceDiscTable.relation    == PriceType::PricePurch      &&
                    PriceDiscTable.AccountCode == TableGroupAll::Table       &&
                    PriceDiscTable.ItemCode    == TableGroupAll::Table       &&
                    PriceDiscTable.ItemRelation== this.ItemRelation          &&
                    PriceDiscTable.RecId       != this.RecId;

                if(PriceDiscTable)
                    this.UpdateMainVendor(PriceDiscTable);
            }
            break;
        default :
            break;
    }
}

public void init()
{
;
    super();

    infolog.globalCache().set(FormStr(InventTable),"RefreshCurrentForm",element);

}

public boolean canClose()
{
    boolean ret;

    ret = super();
    infolog.globalCache().remove(FormStr(InventTable),"RefreshCurrentForm");
    return ret;
}