If Texmaker can't do this is there then any IDE to have that feature for LaTex?
Okay, thanks to samcarter(https://tex.stackexchange.com/users/36296/samcarter), I finally manage to find proper IDE for my problem. It's Sublime. Downloaded it and installed LaTeX-cwl package as well as LaTeXTools and LATeXYZ package to enable suggestions as I wanted. Works like charm..