I tried several ways as in this screen capture:
http://paste.opensuse.org/42234838
I tried with putting * for prefix, label overlay, and rectangle
overlay like below (simplified version), since i'm not sure which one
is the best.

PlasmaComponents.TabButton {
  text: (comicApplet.tabBarButtonStyle & 0x1) ? ( (model.highlight ? "
* " : "") + model.title) : ""

  PlasmaComponents.Label {
      id:d
      text:"*"
      color: theme.highlightColor
      anchors {
	  verticalCenter: parent.verticalCenter
	  left: parent.left
	  leftMargin: 18
      }
  }

  Rectangle {
      id:r
      color: theme.highlightColor
      width: 10
      height: 8
      anchors {
	  bottom: parent.bottom
	  left: parent.left
      }
  }
}

On Sat, Oct 27, 2012 at 8:59 PM, Marco Martin <notmart@gmail.com> wrote:
> On Saturday 27 October 2012, Reza Shah wrote:
>> In c++ version of plasma tabbar, the visual cue need highlight
>> property added to that component.
>> Not sure if this is a good way in qml version. May be like prefixing
>> the title or overlaying the icon can be an option.
>
> you have access directly to tabbar buttons, so just put something in when
> there is unread stuff like a little dot or something
>
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