Index: branches/5.1.x/core/admin_templates/js/simple_grid.js
===================================================================
diff -u -N -r12127 -r13878
--- branches/5.1.x/core/admin_templates/js/simple_grid.js	(.../simple_grid.js)	(revision 12127)
+++ branches/5.1.x/core/admin_templates/js/simple_grid.js	(.../simple_grid.js)	(revision 13878)
@@ -111,34 +111,73 @@
 	return $is_valid;
 }
 
-SimpleGrid.prototype.addRecord = function () {
+SimpleGrid.prototype.addRecord = function ($after_item_id) {
 	var new_item_number = this.nextNumber();
 
 	var $item_mask = this.getControl('mask').value;
 	var $result_html = $item_mask.replace(/#NUMBER#/g, new_item_number);
 
 	var $div = document.createElement('DIV');
 	$div.id = this.IDPrefix + '_' + new_item_number;
-	this.getControl('container').appendChild($div);
+
+	if ($after_item_id === undefined) {
+		this.getControl('container').appendChild($div);
+	}
+	else {
+		$('#' + jq(this.IDPrefix + '_' + $after_item_id)).after($div);
+	}
+
 	$div.innerHTML = $result_html;
 
 	var $js_mask = this.getControl('js_mask').value;
 	var result_js = $js_mask.replace(/#NUMBER#/g, new_item_number);
 	eval(result_js);
+	this.updateTotals();
+
+	return new_item_number;
 }
 
 SimpleGrid.prototype.removeRecord = function ($number) {
-	this.getControl('container').removeChild( this.getControl($number) );
 	var $index = array_search($number, this.ItemIDs);
+
+	if ($index == -1) {
+		// don't allow to delete missing rows
+		return false;
+	}
+
+	this.getControl('container').removeChild( this.getControl($number) );
+
 	this.ItemIDs.splice($index, 1);
+
 	this.renumberRecords();
 	this.updateTotals();
+
+	return true;
 }
 
+SimpleGrid.prototype.removeRecords = function () {
+	while (this.ItemIDs.length > 0) {
+		var $item_id = this.ItemIDs[this.ItemIDs.length - 1];
+		this.removeRecord($item_id);
+	}
+}
+
 SimpleGrid.prototype.updateTotals = function () {
 	// prototype
 }
 
 SimpleGrid.prototype.processRecordDependancies = function ($id) {
 	// prototype
 }
+
+SimpleGrid.prototype.each = function($callback) {
+	var $result = null;
+
+	for (var $i = 0; $i < this.ItemIDs.length; $i++) {
+		$result = $callback.call(this, this.ItemIDs[$i]);
+
+		if ($result === false) {
+			break;
+		}
+	}
+}