I tested @Magicgunnar, but I have problems to figure this out and run it (from the moment it starts) (!). This code is more understandable and correct. Tested for 3.5.X:
CKEDITOR.on('instanceReady',
function( evt ) {
var instanceName = 'textArea_id';
var editor = CKEDITOR.instances[instanceName];
editor.execCommand('maximize');
}
);
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