I've been playing around with the new media manager in WordPress and had some fun with it, but have reached the point where I'm banging my head against a wall.

I have a custom meta box that I'd like to store some images in (well it's a hidden input and I'm currently storing their ID's, but could equally be the image objects), then making an AJAX call to show some thumbnails, which I have subsequently made draggable so users can reorder (not necessarily relevant just some background).

My problem is that when I open the media manager, no images are selected, so if a user wants to edit the pictures in their gallery they need to select them all again.

What I'm trying to figure out, is how do I open the media manager with the current images passed through so they are pre-selected.

So, broadly, my code looks like this

jQuery('#myButton').click(function(e) {
  e.preventDefault();
  frame = wp.media({
    title : 'My Gallery Title',
    multiple : true,
    library : { type : 'image'},
    button : { text : 'Insert' },
  });
  frame.on('close',function() {
    // get selections and save to hidden input plus other AJAX stuff etc.
  }
  frame.open();
});

My thought is that there must be either a parameter to pass into the frame (probably a JSON object of the images, or I need to create an event for 

frame.on('open', function() {
  // Set selected images
}

But I have tried both ways round and am not getting anywhere.

It would appear possible, as changing the 'Featured Image' takes you to the library with the current one selected - I've just been unable to understand the core code sufficiently yet and hope someone else has !

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