Add new react component

[infinium360]

Hi I read all your document architecture and the code. and i want to undestand how a new react component is integrated and executed.
As sample i have study sheets-numfmt pluging. In this plugin a react component has been created : SheetNumfmtPanel
and has been registred as component in a controller
private _initPanel() {
this._componentManager.register(SHEET_NUMFMT_PLUGIN, SheetNumfmtPanel);
}
But even if i look at the _componentManager, i dont see how the component is integrated in the react life cycle. how to inform univer where to display to component SheetNumfmtPanel
Can you help me with that.
Sorry for my approximative english