[Help]Nios II Software build tools for eclipse

Hello, i'm a newbie on FPGA. I have a question about Nios II software build tools for eclipse.

The proble is my Nios II software build tools for Eclipse doesn't have Nios II perspective by default.

I have installed the Nios II EDS v9.1 downloaded from Altera website. I followed the tutorial in Nios II software developer handbook and already read the literature available in the website. But still doesn't have the solution. Can anyone help me to solve the problem? Do I need to add the nios II perspective manually? Or I must download new components/plugin?

Thank you very much beforehand.