I am hosting multiple remote desktop connections using the Remote Desktop Connections app. I have one session on each monitor (two monitors, two sessions). If I bring up a pop-up window within each session (each session now has a parent window and a child window), and click back & forth between the two session pop-up windows on each monitor, the RDP child window of one of the sessions will hide behind all currently opened windows (local windows and the remote parent window) on that monitor.