[Joe_]

You should be more specific in your post then.

Not tested

Code:

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
   if(dialogid == DIALOG_ID_HERE && response)
   {
      // If he responded
      // do ST00F
   }
   return 1;
}

I've not yet used the style

Code:

 DIALOG_STYLE_MSGBOX

But it should be similar to the list one.

EDIT -
I just went and tested it.



This basicly shows a message..
So you could use...

Code:

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
   if(dialogid == DIALOG_ID_HERE && response)
   {
      return 1;
   }
   return 1;
}

So basicly when you choose either one of the buttons (In my case, I just put both to "Cancel")
It will hide the Dialog.