Couple of issues fixed

src/wysihat/commands.js

@@ -386,7 +386,9 @@ WysiHat.Commands = (function(window) {
       } catch(e) { return null; }
     }
 
-    document.activeElement.fire("field:change");
+    if (document.activeElement.fire) {
+      document.activeElement.fire("field:change");
+    }
   }
 
   /**

src/wysihat/events/selection_change.js

@@ -12,7 +12,7 @@ document.on("dom:loaded", function() {
 
     var selectionChangeHandler = function() {
       var element        = document.activeElement;
-      var elementTagName = element.tagName.toLowerCase();
+      var elementTagName = element.tagName ? element.tagName.toLowerCase() : null;
 
       if (elementTagName == "textarea" || elementTagName == "input") {
         previousRange = null;

src/wysihat/toolbar.js

@@ -141,8 +141,12 @@ WysiHat.Toolbar = Class.create((function() {
    *  Bind handler to elements onclick event.
   **/
   function observeButtonClick(element, handler) {
-    element.on('click', function(event) {
+    element.on('mousedown', function(event) {
+      event.stop();
       handler(this.editor);
+    }.bind(this));
+
+    element.on('click', function(event) {
       event.stop();
     }.bind(this));
   }