I used Snoop to take a look at what was happening. It seems that another DataGridColumnHeader is always created behind the one you can modify, and it's not affected by changes on styles. When you set a transparent background, in fact is being correctly applied, so what you see is that ghost header behind (which has the usual grey background) If you apply a coloured background and play with Opacity, you will see how the two colours are mixed.
I don't know if this can be solved.
I used Snoop to take a look at what was happening. It seems that another DataGridColumnHeader is always created behind the one you can modify, and it's not affected by changes on styles. When you set a transparent background, in fact is being correctly applied, so what you see is that ghost header behind (which has the usual grey background).
If you apply a coloured background and play with Opacity, you will see how the two colours are mixed. I don't know if this can be solved.
Hmmm, that is interesting. I can't use Snoop myself, for some reason it does not work with my application. – joerage Feb 3 '10 at 18:20 He,he, I must admit I didn't try your solution.
I wanted to solve it for individual Datagrids, which seems to be impossible. Glad to help! – Natxo Feb 4 '10 at 9:12.
With the answer from Natxo (thanks! ), I was able to find a solution. And it is a simple one too!
Knowing that there was another DataGridColumnHeader behind the one we can modify through the ColumnHeaderStyle, I just had to set a style that will affect all DataGridColumnHeader.
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