AG-420 Improve React implementation

src/dynamicComponentExample/ChildMessageRenderer.jsx

@@ -0,0 +1,19 @@
+import React, {Component} from "react";
+
+export default class ChildMessageRenderer extends Component {
+    constructor(props) {
+        super(props);
+
+        this.invokeParentMethod = this.invokeParentMethod.bind(this);
+    }
+
+    invokeParentMethod() {
+        this.props.context.componentParent.methodFromParent(`Row: ${this.props.node.rowIndex}, Col: ${this.props.colDef.headerName}`)
+    }
+
+    render() {
+        return (
+            <span><button style={{height: 20}} onClick={this.invokeParentMethod}>Invoke Parent</button></span>
+        );
+    }
+};