Button icons

[Richmond]

So, I have a stack with one button and an image "Blob.png",

But none of these scripts inside the button work:

on mouseUp
   set the icon of me to img 1003
end mouseUp

on mouseUp
   set the icon of me to img ID 1003
end mouseUp

on mouseUp
   set the icon of me to img "Blob.png"
end mouseUp

LiveCode 7.0.5  Linux

Richmond.