el-select is not able to collapse when click some where other than the component itself

[yinjs]

Issue Type:

• Bug
• Feature
• Help

Version & Environment:
0.7.4

Description:
click el-select to expand the options. not choose any option but click some where else in the page. the select is not auto collapsed.

[unix]

it look normal here in me, can you upload some code on stackblitz.com ?