Missing Tooltip in TabStripItem

Hello!

I miss the tooltip in htmlb:TabStripItem.

Here ist my view:

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<%@page language="ABAP" %>

<%@extension name="htmlb" prefix="htmlb" %>

<htmlb:form>

<htmlb:tabStrip id = "TS1"

selection = "<%= controller->tabsel %>" >

<htmlb:tabStripItem id = "TSItem1"

index = "1"

onSelect = "TSItemSelect"

title = "1. Starting..."

tooltip = "1. Starting point">

<htmlb:tabStripItemBody>

Starting point...

</htmlb:tabStripItemBody>

</htmlb:tabStripItem>

<htmlb:tabStripItem id = "TSItem2"

index = "2"

onSelect = "TSItemSelect"

title = "2. Key..."

tooltip = "2. Key issues" >

<htmlb:tabStripItemBody>

Key issues...

</htmlb:tabStripItemBody>

</htmlb:tabStripItem>

</htmlb:tabStrip>

</htmlb:form>

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Everything works fine, but no tooltip to see. What I?m doing wrong?

Version 6.20 SP 28

Design=?CLASSIC?

Thank you,

Thilo