I'm creating a gallery for an add-in. I've followed various examples to create the gallery, and I can see how to use buttons to provide the additional functionality offered by stock modules - for example, the "Switch Gallery Size," "All tools," and "Customize" options in the Edit module.
What I can't understand is how to specifically bring up the gallery customization dialog shown below - This is what you get when you click "Customize" at the bottom of the Tools Gallery in the Edit module. Several parts of the SDK documentation refer to "the gallery customization dialog." For instance, the IGalleryItem's basic description is, "Implement this interface for a gallery item class if the gallery needs to be displayed in the gallery customization dialog."
How do we actually bring up this dialog via the SDK?