Removing tab in TabSheet


I have 3 sheets in my TabSheet. The first 2 are closeable, the last one is not closeable.
The second sheet is selected.
When I close the first sheet, then the second sheet becomes the first sheet, but its content is blank.

The generated code looks like this:

<div class="v-tabsheet-tabsheetpanel" style="width: 864px; height: 239px;">
<div style="left: 0px; top: 0px; width: 864px; height: 239px; overflow: auto; visibility: hidden; position: absolute;">
<div class="v-absolutelayout" ...

Why is there this bit ? visibility: hidden
Any chance to fix this or workaround the issue?

Thanks and regards