A TV in a HDMI home network discovers other components that can source a common UI such as a cross-media bar (XMB). The XMB generated by each component is dynamically changed to include UI source icons representing components in the network discovered to have the capability to source the XMB, so that the user can select the component that is to source the UI and then, regardless of what remote control device in the system is used to enter XMB commands to its particular component, the component receiving the commands forwards the commands via CEC to the component that has been selected to source the XMB, avoiding distracting unintentional overlaying of multiple XMBs on top of each other.