1 files changed, 4 insertions, 3 deletions
diff --git a/widgets.js b/widgets.js
index a8644af..57e0697 100644
--- a/widgets.js
+++ b/widgets.js
@@ -493,7 +493,7 @@ function ToggleButtonMorph(
     labelString,
     query, // predicate/selector
     environment,
-    hint,
+    hint, // optional, String or Function
     template, // optional, for cached background images
     minWidth, // <num> optional, if specified label will left-align
     hasPreview, // <bool> show press color on left edge (e.g. category)
@@ -560,12 +560,13 @@ ToggleButtonMorph.prototype.init = function (
 // ToggleButtonMorph events
 
 ToggleButtonMorph.prototype.mouseEnter = function () {
+    var contents = this.hint instanceof Function ? this.hint() : this.hint;
     if (!this.state) {
         this.image = this.highlightImage;
         this.changed();
     }
-    if (this.hint) {
-        this.bubbleHelp(this.hint);
+    if (contents) {
+        this.bubbleHelp(contents);
     }
 };