Access betwen two Layouts

[galdaka]

I have a center region that opens contents in tabs (principalLayout). Each content is a iframe, in this Iframe I have two regions: Center and south (secondaryLayout); The center region is a gridpanel. I want when click in a specified row in the gridpanel (secondaryLayout inside tab) open a new tab in principalLayout.

I try with "document.parent" to access from secondaryLayuout to principalLayout but not work. Any ideas?

[Animal]

window.parent

[galdaka]

Thanks.