With ExtJS 4.2.x I used this way to change Caption: ShowMessage ('Sample Text'); UniSession.AddJS ('Ext.get ("messagebox-1001_header_hd-textEl"). SetHTML ("My Caption")'); (the way given by Delphi Developer here: http://forums.unigui.com/index.php?/topic/8106-prompt-pencere-basligi-degistirme/&do=findComment&comment=41435)
But in the uniGUI 1.0.2.x with ExtJS 6.5.x it does not work, it generates an Ajax error: Ext.Msg.show({title:"New Application",msg:"Sample Text",buttons:Ext.MessageBox.OK});Ext.get("messagebox-1001_header_hd-textEl").setHTML("Your Caption");