Hide border off griditem when image isn't in database

hi,
I made a mxml page that load multiple pictures from a
database using Http service, i want to give that image a button
function and when i press it becomes enlarged in a titlewindow,
I already made the mxml for that titlewindow but dont know
how the code should look like.
can you please help me.

nvm about the first question i already fixed it with an
httpservice and array,
My second question is about these images, they are located in
a griditem with a border, now i want that the border off the
griditem is false when it doens't find an image in my database
i named the griditem grid9 en image id is img9 i tried this
with an if else statement but i receive only errors.
all idea's are welcome.

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