lclintf does noy support it. Simple: it is pure windows API.
And most non-windows widgetsets (all) do not support it correctly.
Try for yourself. (I did)
The fact that its in the LCLIntf means the intend is there, just because it does not work as you would think does not mean it's a windows only thing, it means the other widgets need to fix their code. As you said it, not supported correctly, so where is the fault there?
I don't even know why I replied to this.
Jamie