diff --git a/blocks_vertical/looks.js b/blocks_vertical/looks.js
index 796f83898d..e46055f563 100644
--- a/blocks_vertical/looks.js
+++ b/blocks_vertical/looks.js
@@ -357,6 +357,7 @@ Blockly.Blocks['looks_tintColor'] = {
     this.jsonInit({
       "message0": "tint color",
       "category": Blockly.Categories.looks,
+      "checkboxInFlyout": true,
       "extensions": ["colours_looks", "output_string"]
     });
   }
@@ -784,6 +785,7 @@ Blockly.Blocks["looks_layersGetLayer"] = {
       "inputsInline": true,
       "category": "looks",
       "message0": "layer",
+      "checkboxInFlyout": true,
       "extensions": [
         "output_number",
         "colours_looks"
@@ -918,6 +920,7 @@ Blockly.Blocks["looks_stretchGetX"] = {
   init: function() {
     this.jsonInit({
       "inputsInline": true,
+      "checkboxInFlyout": true,
       "category": "looks",
       "message0": "x stretch",
       "extensions": [
@@ -932,6 +935,7 @@ Blockly.Blocks["looks_stretchGetY"] = {
   init: function() {
     this.jsonInit({
       "inputsInline": true,
+      "checkboxInFlyout": true,
       "category": "looks",
       "message0": "y stretch",
       "extensions": [
@@ -948,6 +952,7 @@ Blockly.Blocks["looks_getSpriteVisible"] = {
       "inputsInline": true,
       "category": "looks",
       "message0": "visible?",
+      "checkboxInFlyout": true,
       "extensions": [
         "output_boolean",
         "colours_looks"
@@ -1004,6 +1009,7 @@ Blockly.Blocks["looks_getEffectValue"] = {
       "inputsInline": true,
       "category": "looks",
       "message0": "%1 effect",
+      "checkboxInFlyout": true,
       "args0": [
         {
           "type": "field_dropdown",
@@ -1038,6 +1044,7 @@ Blockly.Blocks["looks_sayHeight"] = {
       "inputsInline": true,
       "category": "looks",
       "message0": "bubble height",
+      "checkboxInFlyout": true,
       "extensions": [
         "output_string",
         "colours_looks"
@@ -1052,6 +1059,7 @@ Blockly.Blocks["looks_sayWidth"] = {
       "inputsInline": true,
       "category": "looks",
       "message0": "bubble width",
+      "checkboxInFlyout": true,
       "extensions": [
         "output_string",
         "colours_looks"
diff --git a/blocks_vertical/sensing.js b/blocks_vertical/sensing.js
index 958c091eb9..cb2ed88d19 100644
--- a/blocks_vertical/sensing.js
+++ b/blocks_vertical/sensing.js
@@ -443,6 +443,7 @@ Blockly.Blocks['sensing_mousedown'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_MOUSEDOWN,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_boolean"]
     });
   }
@@ -457,6 +458,7 @@ Blockly.Blocks['sensing_mouseclicked'] = {
     this.jsonInit({
       "message0": "mouse clicked?",
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_boolean"]
     });
   }
@@ -511,6 +513,7 @@ Blockly.Blocks['sensing_mousex'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_MOUSEX,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_number"]
     });
   }
@@ -525,6 +528,7 @@ Blockly.Blocks['sensing_mousey'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_MOUSEY,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_number"]
     });
   }
@@ -599,6 +603,7 @@ Blockly.Blocks['sensing_getclipboard'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_CLIPBOARDITEM,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_string"]
     });
   }
@@ -668,6 +673,7 @@ Blockly.Blocks['sensing_loud'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_LOUD,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_boolean"]
     });
   }
@@ -804,6 +810,7 @@ Blockly.Blocks['sensing_dayssince2000'] = {
     this.jsonInit({
       "message0": Blockly.Msg.SENSING_DAYSSINCE2000,
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_number"]
     });
   }
@@ -826,13 +833,14 @@ Blockly.Blocks['sensing_username'] = {
 
 Blockly.Blocks['sensing_loggedin'] = {
   /**
-   * Block to report user's username
+   * pm: Block to report if a user is logged in.
    * @this Blockly.Block
    */
   init: function () {
     this.jsonInit({
       "message0": 'logged in?',
       "category": Blockly.Categories.sensing,
+      "checkboxInFlyout": true,
       "extensions": ["colours_sensing", "output_boolean"]
     });
   }
diff --git a/blocks_vertical/sound.js b/blocks_vertical/sound.js
index eeeeacd01a..4142193f75 100644
--- a/blocks_vertical/sound.js
+++ b/blocks_vertical/sound.js
@@ -341,6 +341,7 @@ Blockly.Blocks['sound_getEffectValue'] = {
     this.jsonInit({
       "inputsInline": true,
       "message0": "%1 effect",
+      "checkboxInFlyout": true,
       "category": Blockly.Categories.sound,
       "args0": [
         {