Interface Buttons

What is your requirement? Where are these buttons going to be used? 

Below is a sample how you could manipulate the style of the button or or you can use the similar logic at the color parameter.

a!localVariables(
  local!values:{1,2,3,4},
  local!selection:0,
  a!buttonArrayLayout(
    buttons: a!forEach(
      items: local!values,
      expression: a!buttonWidget(
        label: concat("button"," ",fv!item),
        value: fv!item,
        saveInto: local!selection,
        style: if(
          local!selection=fv!item,
          "SOLID",
          "OUTLINE"
        )
      )
    )
  )
)

your value that is being saved would evaluate the color. here I have written in a!forEach() for understanding. But if you share us the details on where and what an accurate solution can be provided.

Thank you for the code.
Actually I was doing some mistake in logic but now it worked.

Thank you for the code.
Actually I was doing some mistake in logic but now it worked.