Back & menu button not working Plz help .. topic

Guys I have LG Optimus G pro E980. Recently my screen breaked now I changed sensor and screen but my Back and menu key button some time working some time not.. So please tell me that Can I add Menu and back button key via any modification I mean I wanna add Black line with menu and back keys like other Android smart phone . Please watch this pic When I share. I hope you can understand.. Is it possible that after few modification I get this red line back and menu keys button line..


Sorry for my bad english.