Python Selenium: Accessing Split Container Pane

Question

I'm attempting to access a section of an internal webpage and the structure is setup with:

<div dojotype="i3:I3SplitContainer" ...> 
     <div dojotype="i3:I3SplitContainer" id="leftPane" ...>
     <div dojotype="i3:I3SplitContainer" id="rightPane" ...>

Problem:

Everything in the '...' were the same for the left and right panes. When the page is loaded I'm able to access everything in leftPane and only that. When I try to locate any elements in the rightPane, it's unable to find it.

I've never worked with Split Containers before and wondering if there's a way to switch focus on the panes using Selenium?

I've tried to treat them as switching frames but no luck sadly. Wondering if there's any way to navigate/access the split containers. Thank you!