Error JavaScript

Hello I'm having problems when I create some direct method of JavaScript, it always tells me that I can not get ownership of any library that I'm sending to call. I leave the legend of the error and my code, hoping you can support me.   Technical Message:  Event handler failed with message: No se puede obtener la propiedad 'relTabbar' de referencia nula o sin definir Stack Trace: Client Side Error var tabbar = parent.relationships.relTabbar; var tabTelecom = tabbar.GetTabId("Certificado Gral"); var tabGral = tabbar.GetTabId("Certificado IFT"); tabbar.setTabVisible(tabTelecom, true); tabbar.setTabVisible(tabGral, false); with this code what I try is to hide one or another tab of relationship, take the example of the development guide. Thank you
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