ReactJS + Formsy Mixin implementation issue - reactjs

This is what I have been trying to do:
Sidebar of a page has a couple of links say Step 1, Step 2 etc. The last tab in the sidebar has the Submit button which generates the POST call to my service.
In the parent page called CreateItem.js, I have the sidebar with:
<Sidebar width="15rem" open={true}>
<div>
<div className="panel">
Step 1: Basic Info
</div>
<div className="panel">
Step 2: Content
</div>
</div>
</Sidebar>
<Mainbar>
<div>
<section className="basic-info" id="basic-info">
<BasicInfoPage user={this.props.user} itemId={this.props.params.id} />
</section>
<section className="content" id="content">
<ContentPage user={this.props.user} />
</section>
</div>
</Mainbar>
and each tab has it's own formsy form and render function. Basically all the sections are put into one page but just rendered section by section.
My Questions:
1. How does the submit button in the last section say contentpage gather all the data from all the previous sections above it? I realize there is a formsy onSumbit function but the forms are in each of the sections so I don't understand How I can encapsulate all the data into a single json.
Any help/ tip is greatly appreciated! More than willing to give more info!

I suggest that you should use Flux or Reflux architecture to collect all data of each section and store it in a store. In this way, you can easily get data you want.

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