Q:
How can I load one panel from another?
A:
If in the panel wasn't loaded another page using either URL property of loadPage method,
you can load a page to another panel using loadPage method like this:
JavaScript
spl1.loadPage('RightContent', 'SomePage.html');
Otherwise, if in the panel was already loaded another page, you can load a page to another
panel using loadPage method like this:
JavaScript
window.parent.spl1.loadPage('RightContent', 'SomePage.html');