Drop Down Menu

[Elderin]

I'm trying to implement a drop down menu based on the example at http://wow.gamepedia.com/Using_UIDropDownMenu.

Looking at the example menu image shown with the section "A Complete Example", is it possible to change the border of the drop down frames?

The example uses a function, "function dropDown:SetValue(newValue)", which appears to be a global function. Must it be global? Just trying to save myself the experimentation headaches in case someone already knows.

Or, perhaps there is a better example than the one on gamepedia. I will say that I am trying to stay away from libraries like Ace's and I'm hoping to eliminate as much global pollution as possible.

[Gethe]

function dropDown:SetValue(newValue)

This is not global, it is setting a function to the key "SetValue" on your local "dropDown" table. The structure is essentially this:

local dropDown = {
    SetValue = function(self, newValue)
    end
}

The example is also using the colon syntax to define the function. This provides the function an implicit self argument. Corona Labs has a good tutorial covering colon vs dot syntax.