Form Steps

Sure. You can make the color depending on any condition you like. Setting validate to true on any button is not necessary for this.

Unfortunately, I tried in many ways but it didn't work! 

What are "many ways" and what did not work?

Thanks Stefan! I tried to put validate in the next button and to counter, if the counter are not the same that means this step has an issue then I tried to change the color of it but from what I understood the Stamp field has to take only one Icon. 

So, when I do my personal research to understand a certain problem situation, I start with a very minimal version of it. Once I understand it and I found a solution to make it work, I assemble the larger solution.

Translating this to your case, any parameter of a stamp field can have its own logic to define the value. Play around with this.

Then, you need to understand that the validation setting of a button only controls the behaviour of input fields regarding their required and validations parameters. Nothing else.

So, when I do my personal research to understand a certain problem situation, I start with a very minimal version of it. Once I understand it and I found a solution to make it work, I assemble the larger solution.

Translating this to your case, any parameter of a stamp field can have its own logic to define the value. Play around with this.

Then, you need to understand that the validation setting of a button only controls the behaviour of input fields regarding their required and validations parameters. Nothing else.