HOW TO CREATE A DIALOG IN DYNAMICS AX : X++ CODE

CREATE A DIALOG IN AX : X++ CODE 

class CustDialog extends RunBase
{
DialogField fieldAccount;
DialogField fieldName;
DialogField fieldGroup;
DialogField fieldCurrency;
}

pack() and unpack(0 are used to retain the last used values.
public container pack()
{
return conNull();
}
public boolean unpack(container _packedClass)
{
return true;
}
protected Object dialog()
{

Dialog dialog;
DialogGroup groupCustomer;
DialogGroup groupPayment;
dialog = super();
dialog.caption("Customer information"); dialog.allowUpdateOnSelectCtrl(true);
fieldAccount = dialog.addField(
extendedTypeStr(CustAccount), "Customer account");
fieldName = dialog.addField(extendedTypeStr(CustName));
fieldName.enabled(false);
dialog.addTabPage("Details");
groupCustomer = dialog.addGroup("Setup");
fieldGroup = dialog.addField(
extendedTypeStr(CustGroupId)); fieldCurrency = dialog.addField(
extendedTypeStr(CurrencyCode)); fieldGroup.enabled(false);
fieldCurrency.enabled(false);
groupPayment = dialog.addGroup("Payment");
return dialog;
}

Below method is used to dynamically assign the different values of the cust table
public void dialogSelectCtrl()
{
CustTable custTable;
custTable = CustTable::find(fieldAccount.value()); fieldName.value(custTable.name()); fieldGroup.value(custTable.CustGroup); fieldCurrency.value(custTable.Currency);
}
public static void main(Args _args)
CustSelect custSelect = new CustSelect();
if (CustSelect.prompt()) {
CustSelect.run();
}
}