get the correct tooltip for subitem

[huangshaohuai]

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One of: Bugfix / Feature / Code style update / Refactoring Only / Build related changes / Documentation / Other (please specify)
Bugfix

Overview

Briefly outline your new changes...
get correct var for subitem's tooltip

Issue Number (if applicable) #00

New Vars (if applicable)

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Screenshot (if applicable)

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Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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[Lissy93]

Thanks :)