docs: function Multipanel( canvas ) {
  
  	Panel.call( this, canvas );
  
  	this._config.padding.top = 25;
  	this._config.padding.left = 40;
  
  	this._config.rows = 1;
  	this._config.cols = 1;
  
  	this._config.headers = [];
  	this._config.labels = [];
  
  	// REGISTER //
  	if ( canvas._config.hasOwnProperty( 'panel' ) ) {
  		canvas._config.panel.push( this._config );
  	} else {
  		canvas._config.panel = [ this._config ];
  	}
  	if ( canvas._children.hasOwnProperty( 'panel' ) ) {
  		canvas._children.panel.push( this );
  	} else {
  		canvas._children.panel = [ this ];
  	}
  
  	return this;
  
  }