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In this ngx-graph live demo, under the Options section, there are buttons to Center, Fit In View, etc. I would like to implement these in my solution. However, I cannot find any documentation on how to make these calls, and the demo doesn't provide its source.

In this reference doc it lists center$ and zoomToFit$ observables, but so far I have been unable to successfully subscribe to or trigger these. When I inspect using chrome dev tools it seems that these elements do not exist on the inspected object.

Given the following (simplified) graph setup, how can I wire up the (click) handler of the button at the top to trigger the Centre function?

<button (click)="myGraph.xxxxxx?">Center</button>

<ngx-graph
 #myGraph
 [links]="links"
 [nodes]="nodes"
 [curve]="curve">

 <ng-template #defsTemplate>
 <svg:marker id="arrow" viewBox="0 -5 10 10" refX="8" refY="0" markerWidth="4" markerHeight="4" orient="auto">
 <svg:path d="M0,-5L10,0L0,5" class="arrow-head" />
 </svg:marker>
 </ng-template>

 <ng-template #nodeTemplate let-node>
 <svg:g>
 <svg:rect [attr.width]="node.width" [attr.height]="node.height" [attr.fill]="node.options.color" />
 <svg:text alignment-baseline="central" [attr.x]="10" [attr.y]="node.height / 2">node.label</svg:text>
 </svg:g>
 </ng-template>

 <ng-template #linkTemplate let-link>
 <svg:g class="edge">
 <svg:path>
 </svg:path>
 <svg:text class="edge-label" text-anchor="middle" style="fill: #000000;font-size: 13px">
 <textPath class="text-path" [attr.href]="'#' + link.id" [style.dominant-baseline]="link.dominantBaseline" startOffset="50%">
 link.label
 </textPath>
 </svg:text>
 </svg:g>
 </ng-template>

</ngx-graph>