Dialog in class

class TestDialogClass
{
DialogField fromDate, toDate;

FromDate fDate;
ToDate tDate;
}
----
protected void dialog()
{
Dialog dialog;
DialogField field;
;

dialog = new Dialog("My Dialog");

field = dialog.addField(extendedTypeStr(VendAccount)); // add EmplId field

dialog.run(); // show

if (dialog.closedOK())
{
info(field.value());
}
}
----
public static void main(Args args)
{
TestDialogClass tClass = new TestDialogClass();

tClass.dialog();
}