Unable to change default radio button in button group

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I am building an app in appdesigner which contains a Radio Button Group. I recently decided to add a new radio button option to the button group and want to set it as the new default value on startup. I did this by copying and pasting an existing button. In the Component Browser the new radio button is listed as a child of the button group in the same list as the old buttons.
The problem I'm encountering is that when I try to select the Value checkbox for the new radio button, it automatically changes it to one of the others. Why would this be happening, and how can I fix it? As far as I can see, all of the properties visible in the Inspector tabs are the same for the old and new buttons.

Accepted Answer

Cris LaPierre
Cris LaPierre on 27 Sep 2021
Edited: Cris LaPierre on 27 Sep 2021
I discovered that your workflow works for a brand new radio button group. However, once I close the app and reopen it, if I try to add another button, I see the behavior you report. I tested in R2019b, R2020b, and R2021b. This looks like a bug to me. Please report it here.
In the meantime, the workaround might be to recreate your radio button group with all the buttons.
David K
David K on 27 Sep 2021
Thanks - submitted! FYI, I found an easier workaround to just set the value programmatically in the startupFcn.

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