DataGrid Column header height

I just want to know if it's possible to change the height of the column header in a DataGrid. I have found options for bouth height and width og the row header, but only width option for the column header.

Is it changable, and in that case; how do I change it?

(I need to write two lines of text in the header, and if I can't change the header height, the bottom line will not be shown)

Thanks for all answers! I am really stuck here... :(

plz! I am really stuck here. If anyone have any idea, that might solve my problem, or you have seen this problem before, plz tell me!

So I've been unable to find anything on this for two days now and finally decided just go ahead and manually come up with a solution. First I added a thumb to the bottom of the header then I added a couple of event handlers to give the expected functionality:

private void Thumb_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
{
double change = e.VerticalChange;
RulesGrid.ColumnHeaderHeight = Math.Max(20, RulesGrid.ColumnHeaderHeight + change);
}

private void Thumb_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
RulesGrid.ColumnHeaderHeight = double.NaN;
}

I hope that helps. I really can't understand why this has to be added in the first place...

This is a more complete answer.

private void Thumb_DragDelta(object sender, System.Windows.Controls.Primitives.DragDeltaEventArgs e)
{
double change = e.VerticalChange;
RulesGrid.ColumnHeaderHeight = double.IsNaN(RulesGrid.ColumnHeaderHeight) ? mousePosition.Y : // mouse position gotten from
Math.Max(20, RulesGrid.ColumnHeaderHeight + change);
}

private void Thumb_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
RulesGrid.ColumnHeaderHeight = double.NaN;
}