Luismin on "Add plugin to editor"

Hi.

I'm going to add a button to my WordPress Editor like a plugin. So, I need to know where is the init call to put some code in order to call to my plugin.

Something like this plugins : "simplelink" theme_advanced_buttons1 : simplelink"

I think It's in "class-wp-editor.php" but I do not where. Any help?

Thanks!