Summary:
by key bindings..
now we can select TAB with the Return/Space key.
Test Plan: elementary_test -to efl.ui.tab_pager
Reviewers: Jaehyun_Cho, Hermet
Reviewed By: Jaehyun_Cho
Subscribers: YOhoho, cedric, #reviewers, #committers, zmike
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D6779