By 'create your own DataGridHeader' you mean extending that class?
I've read the article linked for Q2 and another that was linked in that one.
It says everything besides aligning vertically be it text or arrows.
There are 2 comments asking for the same, but those aren't answered either. So! Can you align text in headers of DataGrid columns vertically?
Thank you again!
Yes extending the DataGridHeader was my suggestion, you mention this link
If that doesn't do what you want then implementing your custom DataGridHeaders will be the way to go.
Yes, that was the link and it does not mention anything about vertically aranging headerText.
So extending is probably the only way for Flex 3 framework.