Implementing a cursor and text background color

[dvestal]

I'm creating a simple text editor for an in-house application.
Ordinarily, I'd slap a textbox onto a form and call it done, but for
various reasons, I'll have to implement this one from scratch.

Here are various questions that have arisen so far:

1) Any tips on implementing a simple blinking cursor to show the text
entry point? So far, I don't have an idea better than adding a timer
to the form, and invalidating that particular portion of the window
every half-second or so.

2) I need to highlight the text that is selected, but .NET seems not
to allow setting the background color of text. So far, my solution is
to fill the rectangle that the text will inhabit, then draw the text
on top of that. Is there a better way?

3) I've added scrollbars manually to the control. Any tips on
capturing scroll-wheel events and manually sending them to the
scrollbar?

Thanks,
-David