"Always One Selected Value" option is disabled in list boxes

[#1]

Hi

There are couple of list boxes in my application where "Always One Selected Value" is disabled. I want to check that option so that always one is selected by default. Not sure why this option is disabled for certain list boxes.

Can anyone help me out please!

[juan_c_martinez]

This is the correct answer.

Thaks for your  time!

Juan C.

[Sakura]

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