InfoPath Dev

 If I use ' /my:myFields/my:Purchase/my:PurchaseDetails/my:Quote/my:ControlSwitch', it doesn't throw exception, but it always goes to the first item, instead of current item.  If  it use my:ControlSwitch or /my:Quote/my:ControlSwitch, It throws Null Reference exception, although it is fine when I use my:ControlSwitch in ...

 I can assign value in the button click event.  It works fine public void NewVendor_Clicked(object sender, ClickedEventArgs e) { e.Source.SelectSingleNode("my:ControlSwitch", NamespaceManager).SetValue("ShowComponent");}     But I got error when I tried to do the same thing in dropdown box ...