Gui .png overlay for ironsites

I want to make a .png overlay on my screen to simulate ironsites for my guns.

I created a "rifleiron.gui" using the gui editor.

I exec it where it needs to be. Now, when I re run the gui editor, its there.

then, in default.bind.cs I add

$IronRifleState = false;
function toggleIronRifle() {
if ($IronRifle == false) {
Canvas.setContent( IronRifle );
$IronRifle = true;
} else {
Canvas.setContent( PlayGui );
$IronRifle = false;
}

}


moveMap.bindCmd(mouse0, button1, "toggleIronRifle();" );

Now, when I press mouse button 1, it should toggle the rifle iron sites on.

I also added the movemap.bind in /client/config.cs

now, its not working, when I press the button.

Am I missing something? Am I going about this wrong?

Could someone PLEASE help me?