Let me describe my problem which I have with my subform.

As you can see from the image below I have two fields. The first is a lookup field (Excursion_Name) and the second is a dropdown (Optional_Rates1).

In the on user input of the lookup field I wrote the following:

1. if (row.Excursion_Name  ==  "Included Excursion Land & People")
2. {  
4.     row.Optional_Rates1:ui.add("Bus Transfer");
5.     row.Optional_Rates1:ui.add("Guide");
6. }

With that it fills the Optional Rates field with two values.

Lets say that I choose 'Guide' and click Submit

If I want to Edit the record then in the On Edit -> On load I wrote again the following

2. for each r in Subform
3. {
4.       if (r.Excursion_Name  ==  "Included Excursion Land & People")
5.       {       
7.             r.Optional_Rates1:ui.add("Bus Transfer");
8.             r.Optional_Rates1:ui.add("Guide");
9.       }

This is because I want to choose another choice.

Then it shows me the following:

Of course in the dropdown it shows me the 2 choices Bus Transfer and Guide (like the 1st Image) but it fetches the record value (Guide in this example) in a Textbox. 

Why this happens? Why it fetches the 'Guide' in a Textbox and not as a default value inside the dropdown menu?