mmmhh.... some thing like:
<style>
/* rotacion de texto */
.datagrid-header-row td  {
	height:40px; /* need to be properly fixed */
	-webkit-transform: rotate(-90deg); /* Safari */
	-moz-transform: rotate(-90deg); /* Firefox */
	-ms-transform: rotate(-90deg); /* IE */
	-o-transform: rotate(-90deg); /* Opera */
	/* Internet Explorer */
	filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
}
</style>
but, still needs some work in proper header cells width/height :-)