How to "link" a frame of an image sheet to a button on a segmented control? In lua

I am creating a practice widget for a class and I am trying to connect three frames in an image sheet to three different buttons on a segmented control.

Here is the code I have for the image sheet

    -- Create the image sheet and options
local options = {
    width = 240,
    height = 80,
    numFrames = 3
}

-- Create the hearts image
local heartSheet = graphics.newImageSheet( "heartcontainersfinalz.png", options )

local sequenceData = {
    { x=0, y=0, width=60, height=20 },
    { x=40, y=0, width=60, height=20 },
    { x=60, y=0, width=60, height=20 }
}
hearts = display.newImage( heartSheet, sequenceData )
hearts.x, hearts.y = 160, 350

and the code for the segmented control

-- Create the segmented control widget
    local segmentedControl = widget2.newSegmentedControl
    {
        left = 50,
        top = 100,
        segmentWidth = 75,
        segments = { "One", "Two", "Three" },
        defaultSegment = 1,
        onPress = onSegmentPress
    }

So far I have the first frame of the image sheet displayed and above it I have the segmented control. So as I said I need the first button on the segmented control to display the first frame of the image sheet, second button to display the second frame, etc... Thanks in advance.