[fixed] shift+tab

closes #23

Author: mzabriskie

lib/components/ModalPortal.js

@@ -18,6 +18,8 @@ var CLASS_NAMES = {
   }
 };
 
+var OVERLAY_STYLES = { position: 'fixed', left: 0, right: 0, top: 0, bottom: 0 };
+
 function stopPropagation(event) {
   event.stopPropagation();
 }
@@ -102,7 +104,7 @@ var ModalPortal = module.exports = React.createClass({
   },
 
   handleKeyDown: function(event) {
-    if (event.keyCode == 9 /*tab*/) scopeTab(this.getDOMNode(), event);
+    if (event.keyCode == 9 /*tab*/) scopeTab(this.refs.content.getDOMNode(), event);
     if (event.keyCode == 27 /*esc*/) this.requestClose();
   },
 
@@ -126,8 +128,6 @@ var ModalPortal = module.exports = React.createClass({
     return !this.props.isOpen && !this.state.beforeClose;
   },
 
-  overlayStyles: { position: 'fixed', left: 0, right: 0, top: 0, bottom: 0 },
-
   buildClassName: function(which) {
     var className = CLASS_NAMES[which].base;
     if (this.state.afterOpen)
@@ -142,7 +142,7 @@ var ModalPortal = module.exports = React.createClass({
       div({
         ref: "overlay",
         className: cx(this.buildClassName('overlay'), this.props.overlayClassName),
-        style: this.overlayStyles,
+        style: OVERLAY_STYLES,
         onClick: this.handleOverlayClick
       },
         div({