<div><span style="font-size: large;">Hi All£¬</span></div><div><span style="font-size: large;">I have used the <span style="font-family: Tahoma, "Microsoft Yahei", Simsun;">osgViewer::CompositeViewer generating two viewers£¬and I have overrided the method </span><span style="font-family: Tahoma, "Microsoft Yahei", Simsun;">handle£¨£©of </span><span style="font-family: Tahoma, "Microsoft Yahei", Simsun;">osgGA::GUIEventHandler £¬</span><span style="font-family: Tahoma, "Microsoft Yahei", Simsun;">BUT finally just only the viewer where the cursor in  is responded.</span></span></div><div><span style="font-size: large;"><span style="font-family: Tahoma, "Microsoft Yahei", Simsun;">My question is how to make the two viewers  events  synchronization</span><span style="outline: 0px; font-family: Arial, sans-serif; background-color: rgb(252, 252, 254);"> through just one keyboard click.</span></span></div><div><span style="font-size: large;"><span style="outline: 0px; font-family: Arial, sans-serif; background-color: rgb(252, 252, 254);"><br></span></span></div><div><span style="outline: 0px; font-family: Arial, sans-serif; background-color: rgb(252, 252, 254); font-size: large;">Thank you very much£¡</span></div><div><span style="outline: 0px; font-family: Arial, sans-serif; background-color: rgb(252, 252, 254); font-size: large;"><br></span></div><div><span style="outline: 0px; font-family: Arial, sans-serif; background-color: rgb(252, 252, 254); font-size: large;">Judy</span></div><div><a class="search-js" href="http://dict.youdao.com/w/event%20synchronization/#keyfrom=E2Ctranslation"></a></div>