Need DTC drop-down box to show first item in list

[Guest_imported]

Hello. I have a DTC drop-down box (cbo1) I'm using in my app. When the user selects another drop-down (cbo2), cbo1 reflects this selection and everything is fine.

When the user selects a DTC button to Add a New Record, they can also click on cbo1 and select an item. The problem is, after the user clicks on the DTC button, my cbo1 drop-down doesn't move to the first item. Instead, it may show any item in the list. Is there a way for me to force this drop-down to move to the first item after selecting the DTC button?

Thank you for your help.
Rene

 

[Metka]

Selecting the first item in listbox DTC:

cbo1.selectedIndex = 0

 

[Guest_imported]

Worked perfectly. Thank you so much!