code: function( id ) {
  			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
  			if ( !tab || this._.pageCount == 1 || !tab.isVisible() )
  				return;
  			// Switch to other tab first when we're hiding the active tab.
  			else if ( id == this._.currentTabId )
  				this.selectPage( getPreviousVisibleTab.call( this ) );
  
  			tab.hide();
  			this._.pageCount--;
  			this.updateStyle();
  		}
docs: Hides a page's tab away from the dialog.
  
  dialog.hidePage( 'tab_3' );
  
  @param {String} id The page's Id.