Broke <FunctionSpecField/> into smaller parts.

src/components/fields/_SpecProperty.jsx

@@ -0,0 +1,32 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+
+import SpecField from './SpecField'
+import FunctionButtons from './_FunctionButtons'
+import InputBlock from '../inputs/InputBlock'
+
+import labelFromFieldName from './_labelFromFieldName'
+
+
+export default class SpecProperty extends React.Component {
+  static propTypes = {
+    onZoomClick: PropTypes.func.isRequired,
+    onDataClick: PropTypes.func.isRequired
+  }
+
+  render() {
+    const functionBtn = <FunctionButtons
+      fieldSpec={this.props.fieldSpec}
+      onZoomClick={this.props.onZoomClick}
+      onDataClick={this.props.onDataClick} 
+    />
+
+    return <InputBlock
+      doc={this.props.fieldSpec.doc}
+      label={labelFromFieldName(this.props.fieldName)}
+      action={functionBtn}
+    >
+      <SpecField {...this.props} />
+    </InputBlock>
+  }
+}