async registerElementOverlay(...aArgs) {
			const [oOverlay] = aArgs;
			const oModel = oOverlay.getElement().getModel();
			if (oModel) {
				const oMetaModel = oModel.getMetaModel();
				if (oMetaModel && oMetaModel.loaded) {
					await oMetaModel.loaded();
					this.evaluateEditable([oOverlay], {onRegistration: true});
				}
			}
			Plugin.prototype.registerElementOverlay.apply(this, aArgs);
		}
Register an overlay
If the MetaModel was not loaded yet when evaluating addViaDelegate, the
plugin returns editable = false. Therefore we must make an extra check after
the MetaModel is loaded.
@param {sap.ui.dt.Overlay} oOverlay - Overlay object
@override