header style in "em" unit does not work as expected

Setting the row height in "em" unit works great. The line height grows or shrinks adequately when augmenting the font size, using CTRL+ and CTRL-
<style>
.aw-system-control {font-size:100%;}
</style>
...
obj.getRowTemplate().setStyle("height","1.3em");

For some reason, this does not work at all with Headers
obj.getHeaderTemplate().setStyle("height","2em");
Any idea?

There is also an issue with Combo as I mentioned in an earlier post. Any idea?

The only way to change the height of the grid header is setHeaderHeight(num) method, which expects numeric argument. Using "em" units will not work.

I see. Is it a feature for a future release ?