Expanding icons task manager: Missed text description for task in vertical panel

When panel is aligned to top or bottom, Expanding icons task manager works well - it show icon and text title, here is screenshot: http://i.imgur.com/Ze3YlCT.png

But when panel is aligned to left or right, it shows only icons: http://i.imgur.com/xGWA9ve.png

I try to research settings but not find any option for enable texts in this mode.

Here is screenshot from Plasma default Task manager: http://i.imgur.com/InNhjsg.png - all looks good

Can you add text titles in vertical panel mode (maybe via separate option in settings)?

Thanks.