DRAWITEMSTRUCT confusion.

I am trying to get different fonts into a combobox. I have a pointer to the DRAWITEMSTRUCT, but I'm not sure what to do with it! Do I need to draw the text to an HDC, and blit it via the pointer's HDC? But then how will the user select the text normally? I'm just not sure how to go about this - even though I've read a lot of documentation about it, very unsure...any help appreciated.

[edit]

Ok. I have all that sorted out now. Now my problem is that I want to signal to Windows that the user is changing fonts so that I can update the measure of each item. I tried sending a CB_SETITEMDATA message, etc, but this obviously isn't the way. Any ideas?

How does the user change fonts?

that is once you know the users font selection, call for a paint and then use the new font size.

I get the font from a CHOOSEFONT structure passed to the ChooseFont dialog function. The painting is simple. Problem is, when the user changes fonts, the underlying "virtual" text in the combobox still measures the size of the old font. So let's say the user chooses a font that it twice the old font height. After I update the view, the user expects to be able to click a line and have that text pop up into the combobox's edit control. Instead, they click on line #4, but get line #8 because the old font was smaller!

Initially, when the combobox is created, Windows gets the dimensions of the virtual text when you respond to the WM_MEASUREITEM message, (filling in a MEASUREITEMSTRUCT it passes you).

So basically, I need to stimulate Windows to send a WM_MEASUREITEM message whenever the font changes...