Window API Problems :(

So, I've benn doing some work, been trying to make a storage program.
Full src: http://pastebin.com/Ru3A2nFe
But, when I do this

alertWindows[par1].setVisible(false)

alertWindows is a window array

It simply does not hide it!
But I can write to it, change text color…
Please help me
Sincerely, Roberto

Using .setVisible(false) does not actually undraw your window as it says on the wiki page.

You have to draw something over the top of it for it to disappear.

I believe setVisible does not erase the on screen characters, it simply stops farther renders.

alertWindows[par1].write( "hello" )  --#writes hello
alertWindows[par1].setVisible( false )  --#does nothing visible
alertWindows[par1].write( "world" )  --#does nothing visible

However, if you have another window below it you want to see, you can use window.redraw()