Are you talking about the default behavior of the Roku Options overlay? It should override the app-specific behavior of the options/star button when and only when the Video node is in focus.

Edit: you can see some description of this behavior here. OnKeyEvent() is not fired when the Video node is in focus and the options key is pressed on the remote, because Roku is taking control of the options key to control their overlay.

Your question is a little unclear though—is the problem that this default behavior is not happening as it should (i.e. the overlay is not appearing) or that the default behavior is happening (i.e. that roku is taking control of the options button from your app when the Video node is in focus, so that you can't control what happens when the options key is pressed when a video is playing)? The former could be caused by a failure to properly put the Video node in focus or something. The latter is just something that Roku requires you to deal with I think.

Yes i am talking about default behavior of the Roku Options overlay. It is not displaying when click on options / star button when the focus is on video node only even though pop up is not displayed but the remaining all other buttons(Rewind ,play/stop,ok,fastforward) working fine .I have tried so many types for getting subtitles but I am unable display the subtitles 

I have followed the below three types of code  getting subtitles and popup overlay.
one :
          videocontent = createObject("RoSGNode", "ContentNode")
           videocontent.HttpHeaders = headers
           videocontent.title = m.ContentNode_child_object.title
           videocontent.streamformat = "dash"
           subtitle_config = {
                   TrackName: “sample.srt"
                              }
           videocontent.subtitleconfig = subtitle_config
           videocontent.url = “URL”  
           m.video.content = videocontent
           m.video.control = "play"
           m.video.visible = true
           m.video.setFocus(true)
Two : 
          videocontent = createObject("RoSGNode","ContentNode")
          videocontent.HttpHeaders = headers
            videocontent.title = m.ContentNode_child_object.title
           videocontent.streamformat = "dash"
           m.video.globalCaptionMode = "On"
           m.video.subtitleTrack = "http://path.to/my/file.srt"
           videocontent.url = “URL”  
           m.video.content = videocontent
           m.video.control = "play"
           m.video.visible = true
           m.video.setFocus(true)
Third :
           videocontent = createObject("RoSGNode", "ContentNode")
           videocontent.HttpHeaders = headers
           videocontent.title = m.ContentNode_child_object.title
           videocontent.streamformat = "dash"
           videocontent.SubtitleURL= "http://path.to/my/file.srt"  
           videocontent.url = “URL”  
           m.video.content = videocontent
           m.video.control = "play". 
           m.video.visible = true
           m.video.setFocus(true)