Grimrock

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-- is this event enabled?
enabled = true

-- name of the imeage to show
image = "mod_assets/images/example-image.dds"

-- todo: the following x,y coords are temporary.
--       They should be calculated automatically.

-- image position
image_x = 40
image_y = 60

-- text description position
text_x = 220
text_y = 60

-- buttons position
buttons_x = 220
buttons_y = 160
buttons_width = 200

-- initial state
state = 1

-- functions called after specific buttons being pressed
function onHeal()
    hudPrint("Healing!")
    state = 2
end

function onTalk()
    hudPrint("Dwarf is in too much pain to talk.")
end

function onLeave()
    enabled = false
end

function onHealed()
    hudPrint("He is healed already!")
end

-- defines states. Each entry must have exactly two columns:
-- first is state number, the second is description shown.
states = {
  { 1, "An injured dwarf lies on the ground before you,\n" ..
       "nearly unconscious from his wounds." },
  { 2, "The healed dwarf is happy." }
}

-- defines possible actions in each state. Each entry has
-- 3 values. First is state number. Second is action name
-- (will be printed on a button). The third is a function
-- that will be called when action is taken (i.e. button
-- is pressed).
actions = {
  { 1, "tend his wounds", onHeal },
  { 1, "talk", onTalk },
  { 1, "leave", onLeave},
  { 2, "healed", onHealed}
}

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-- create 200x200 rectangle to postion 20,20  
local dialog = gw.createElement('rect','my_dialog',20,20,200,200)
-- create button as a child of dialog. All coordinates become relative to parent
dialog.addElement('button','my_button',20,150,20,100)

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Why do we need to set dialog.class to any specific value? In what context that would be useful? That's an honest question.