First, you have to access the element you need to see. On your case, the ""pane it's a Control Type Panel inside the main window, so you gonna have to do something like this:
var automation = new UIA3Automation();
var app = FlaUI.Core.Application.Attach(application.Process.Id); //Here you can attach or start a application by path
var window = app.GetMainWindow(automation); //Get hold of the window
var allObj = window.FindAllChildren();
var panel = allObj.Where(x => x.AutomationId == "16386096").FirstOrDefault().FindAllChildren(); //Here you can use other property unique to the panel, I used the AutomationId for example
After you get hold of the panel, you can now find all the children objects.emphasized text