_buildPreviewURL() {
			const sUrl = this._buildReturnedURL();
			const oResolver = Element.getElementById("sapUiRtaAddIFrameDialog_PreviewLinkResolver");
			try {
				oResolver.applySettings({
					text: sUrl
				});
			} catch (err) {
				return undefined;
			}
			return oResolver.getText();
		}
Build preview URL
@returns {string} URL with resolved bindings
@private