Access an attribute of a React component

I'm using the GoJS library in React through integration React GoJS , so I can create a diagram in a very simple way, as stated in the example:

<GojsDiagram
  diagramId="myDiagramDiv"
  model={this.props.model}
  createDiagram={this.createDiagram}
  className="myDiagram"
  onModelChange={this.modelChangedhandler}
/>

where my createDiagram() method is responsible for creating my diagram (note typing, since I'm using TS. Diagram is a class of the library itself)

private createDiagram: Diagram {

    const _diagram = ...
    return _diagram;
}

My problem is programmatically zooming in my diagram. To do this, I need to access the _diagram object I created, as described here , such as _diagram.CommandHandler.increaseZoom() . The point is that my object does not exist. I've already tried instantiating it as an attribute of the class and supplying it as props of component GojsDiagram , but I'm stuck in a typing problem. I already tried to set this same attribute within the createDiagram method, but when deploying the zoom, nothing happens.

Looking at the source code of the component, I saw that the diagram I want is instantiated:

class GojsDiagram<N extends BaseNodeModel, L extends LinkModel> extends React.PureComponent<GojsDiagramProps<N, L>> {
  private myDiagram: Diagram; <-- aqui!
  private modelChangedHandlers = [
    new AddNodeModelChangedHandler<N, L>(),
    ...

Is there any way to access this object and execute a method of it? Is there any other way to solve this problem?