During search I found link codeplex for X++ extension, freely available Extensions at CodePlex by José Antonio Estevan Estevan. This extension helped me to identify
- Starting and ending of brackets.
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- Collapse and un-collapse sections wrapped with {- and }-brackets.
- Highlight the all occurrence of keyword in method similar to NotePad++
Installation of this extension is also very easy.
- Download Zip file from following link from codeplex. http://ax2012editorext.codeplex.com/
- Extract zip file.
- Close all Dynamics Ax client instances on development machine.
- Copy all files in extracted folder.
- Paste all in following location.
X:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin\EditorComponents 
Inspiration: http://yetanotherdynamicsaxblog.blogspot.com/2013/03/free-editor-extensions-for-ax2012.html