Change color on checkbox click

[jedimaster_att]

Good afternoon,

I am attempting to change the horizontal arrangement when the checkbox inside it is clicked. I can acomplish this when I do it individually, but I would like to do it on a global scale. I keep getting the error

"Property getter was expecting a com.google.appinventor.components.runtime.Button component but got a YailList instead"

I am not sure what I am missing here, I have searched around for the answer but have come up short. Please see what I have so far.

Thank you!

[Patryk_F]

There must be a component here, not a component list.

[ABG]

Wrap the block with a

  for each Arrangement in global Horizontal_Arrangement
     ser background color of Arrangement to ...

[jedimaster_att]

Thank you for help! I am getting closer... when I add the code below it will change the 1st horizontal arrangement but it wont change any of the other arrangements...

[ABG]

Export your .aia file and upload it here.