diff --git a/Text/Custom string.sketchplugin b/Text/Custom string.sketchplugin
index 9331f65..00986a4 100644
--- a/Text/Custom string.sketchplugin	
+++ b/Text/Custom string.sketchplugin	
@@ -4,57 +4,78 @@ if([selection count] == 0) {
 else exec();
 
 function exec(){
-	var alertMessage = "Example: Price [0-20]$ [old~new]";
+	createCheckbox = function ( label, value, flag ) {
+		flag = ( flag == false ) ? NSOffState : NSOnState;
+		var checkbox = NSButton.alloc().initWithFrame( NSMakeRect( 0, 0, 300, 18 ) );
+		checkbox.setButtonType( NSSwitchButton );
+		checkbox.setTitle( label );
+		checkbox.setTag( value );
+		checkbox.setState( flag );
 
-	var inputString = [doc askForUserInput:alertMessage initialValue:""];
+		return checkbox;
+	}
+	var userInput = COSAlertWindow.new();	
 
-	var regexBlocks = new RegExp("\\[[^\\]]*");
-	var regexWords = new RegExp("\\[[^~]+~.+\\]");
-	var regexNumberRange = new RegExp("\\[\\d+-\\d+\\]");
+	userInput.setMessageText("Rename Text Layers");
+	userInput.addTextLabelWithValue("Example: Price [0-20]$ [old~new]");
+	userInput.addTextFieldWithValue("");
+	userInput.addAccessoryView( createCheckbox( 'rename layers', 'r', false ) );
+	userInput.addButtonWithTitle('OK');
+	userInput.addButtonWithTitle('Cancel');
 
-	var blocks = [];
-	var opening = inputString.indexOf("[");
-	var closing = inputString.indexOf("]", opening);
-	if(opening != -1 && closing != -1) blocks.push(inputString.slice(0, opening));
-	else blocks.push(inputString);
+	var responseCode = userInput.runModal();
 
-	while(opening != -1 && closing != -1){
-		blocks.push(inputString.slice(opening, closing+1));
-		opening = inputString.indexOf("[", closing);
-		blocks.push(inputString.slice(closing+1, opening));
-		closing = inputString.indexOf("]", opening);
-	}
+	if(1000 == responseCode){
+		var inputString = userInput.viewAtIndex(1).stringValue();
+		var renameLayers = userInput.viewAtIndex(2).state()
+		var regexBlocks = new RegExp("\\[[^\\]]*");
+		var regexWords = new RegExp("\\[[^~]+~.+\\]");
+		var regexNumberRange = new RegExp("\\[\\d+-\\d+\\]");
+
+		var blocks = [];
+		var opening = inputString.indexOf("[");
+		var closing = inputString.indexOf("]", opening);
+		if(opening != -1 && closing != -1) blocks.push(inputString.slice(0, opening));
+		else blocks.push(inputString);
 
-	blocks = blocks.map(function(block){
-		if(block.match(regexNumberRange)){ //Number range
-			var min = block.match(/\d+/)[0],
-				max = block.match(/-[\d]*/)[0].replace("]","").replace("-","");
-				return getRandomNumber.bind(null, min,max);
+		while(opening != -1 && closing != -1){
+			blocks.push(inputString.slice(opening, closing+1));
+			opening = inputString.indexOf("[", closing);
+			blocks.push(inputString.slice(closing+1, opening));
+			closing = inputString.indexOf("]", opening);
 		}
-		else if(block.match(regexWords)) { //Words list
-			block = block.replace("[","");
-			block = block.replace("]","");
-			var words = block.split("~");
-			return getRandomWord.bind(null, words);
+
+		blocks = blocks.map(function(block){
+			if(block.match(regexNumberRange)){ //Number range
+				var min = block.match(/\d+/)[0],
+					max = block.match(/-[\d]*/)[0].replace("]","").replace("-","");
+					return getRandomNumber.bind(null, min,max);
+			}
+			else if(block.match(regexWords)) { //Words list
+				block = block.replace("[","");
+				block = block.replace("]","");
+				var words = block.split("~");
+				return getRandomWord.bind(null, words);
+			}
+			else return block;
+		});
+
+		function getRandomNumber (min, max) {
+			min = new Number(min);
+			max = new Number(max);
+		    return Math.floor( Math.random() * (max - min) + min );
 		}
-		else return block;
-	});
+		function getRandomWord (words) { 
+			var index = getRandomNumber(0,words.length);
+			return words[index] 
+		};
 
-	function getRandomNumber (min, max) {
-		min = new Number(min);
-		max = new Number(max);
-	    return Math.floor( Math.random() * (max - min) + min );
-	}
-	function getRandomWord (words) { 
-		var index = getRandomNumber(0,words.length);
-		return words[index] 
-	};
-
-	for (var i = 0, l = [selection count]; i < l; i++) { //Loop every selected layer
-		var layer = selection[i];
-		var generatedString = blocks.map(function(block){ return typeof block === "function" ? block() : block; }).join("");
-		[layer setStringValue: generatedString];
-		[layer setName: generatedString];
-	}
+		for (var i = 0, l = [selection count]; i < l; i++) { //Loop every selected layer
+			var layer = selection[i];
+			var generatedString = blocks.map(function(block){ return typeof block === "function" ? block() : block; }).join("");
+			[layer setStringValue: generatedString];
+			if(renameLayers) [layer setName: generatedString];
+		}
 
+	}
 }