What's the hidden/JASS features of dialog?

[Tal'Rarity]

I've noticed some maps have dialogs where you can press hotkeys such as A or U to hit the button, as well able to increase the size of the dialog itself not the button to be read more like a page then a little block.

 

[PurgeandFire]

Here is the native:

native DialogAddButton              takes dialog whichDialog, string buttonText, integer hotkey returns button

You can specify an integer hotkey for that particular button, e.g. 'A' or 'B' (ASCII representations). There are also some additional hotkeys (although, I don't recommend using the ones that aren't supported on some laptops, e.g. "home"/"end"/"numpad" etc.). I made a list of a lot of them here (check the globals block):
http://www.hiveworkshop.com/forums/jass-resources-412/snippet-dialog-wrapper-240003/
Here is an example:

call DialogAddButton(dg, "hello", 'A')

That will allow you to press "A" to press that button (shift doesn't matter).

As for the page thing--you don't actually increase the size directly. Instead, you just set a really long title (or maybe you use "\n", a linebreak, to take up multiple lines with your message. I forget). DialogSetMessage(dialog, string)

 

[Tal'Rarity]

Thanks Purge.