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I do not know what you mean when you say, "terminal like ...kind of behavior ".
Or, to be honest, what you mean by "exact char positioning".
Can you give us some more detail?
i would like to build a character terminal frontend. fo this i need something like a matrix of characters. (eg. tell the char at 10th line 2nd row to change color and handle almost all kind of keypresses.)
later it would be good to extend the features to support full ansi, vt100 standards.
Ahh, I see, you really mean "terminal"! Using an RIA to simulate a character-based UI, what an interesting idea.
I am sorry but i don't have many suggestions. This is definitely counter to the direction of usual RIA thinking.
If you used a TextArea control with a fixed-pitch font, you could probably use the selection manager methods to manipulate individual characters successfully.