Create Purchase Order with multiple lines Using X++ and using Progress bar/ loader while creating PO lines

    // I added below code in Clicked() of  button control


    NumberSeq       numberSeq;
    Purchtable      Purchtable;
    PurchLine       PurchLine;
    PurchFormLetter purchFormLetter;
    InventDim       inventDimm;
    container       c;
    int             i ;
    Args            args;
    FormRun         formRun;

    // declare macro for progress bar

    #AviFiles

  // for progress bar
    SysOperationProgress progress = new SysOperationProgress();

   // To get multiple selected items from "SysLookupMultiselectCtrl   msCtrl;" adding to container

    c = msCtrl.getSelectedFieldValues();

    ttsbegin;

    numberSeq =NumberSeq::newGetNum(purchparameters::numRefPurchId(),true);

    // Initialize Purchase order values
    Purchtable.initValue();
    Purchtable.PurchId = numberSeq.num();
    Purchtable.OrderAccount = 'US_TX_001';
    Purchtable.CurrencyCode = 'USD';
    Purchtable.initFromVendTable();
    if (!Purchtable.validateWrite())
    {
        throw Exception::Error;
    }
    Purchtable.insert();

    //For progress bar
    progress.setCaption("Creating PO Lines");
    progress.setAnimation(#AviUpdate);
    progress.setTotal(conlen(c));

    for(i = 1; i<= conLen(c); i++ )
    {

        PurchLine.PurchId = Purchtable.PurchId;
        PurchLine.ItemId = conPeek(c,i);

       // for progress bar
        progress.setText(strfmt("creating line for Item %1", conPeek(c,i)));
        progress.setCount(i, 1);

        inventDimm.InventLocationId = InventDim_InventLocationId.valueStr();
        inventDimm.InventSiteId =  InventDim_InventSiteId.valueStr();
        PurchLine.PurchQty = PurchLine_PurchQty.realValue() ;

        PurchLine.createLine(true, true, true, true, true, false);
        PurchLine.clear();

    }
    ttsCommit;

        args = new Args(formstr(PurchTable));
        formRun = classFactory.formRunClass(args);
        formRun.init();
        formRun.run();
        formRun.wait();

}