Fix SidePane initialization.

The element is not necessarily attached to the DOM when refreshRendering() runs.
This bug caused test failures in tests/unit/SidePane.js.
Refs ibm-js/delite#385.

SidePane.js

@@ -101,6 +101,10 @@ define([
 			_originX: NaN,
 			_originY: NaN,
 
+			attachedCallback: function () {
+				this.parentNode.style.overflow = "hidden";
+			},
+
 			show: dcl.superCall(function (sup) {
 				return function () {
 					if (arguments.length > 0) {
@@ -275,7 +279,6 @@ define([
 			},
 
 			refreshRendering: function (props) {
-				this.parentNode.style.overflow = "hidden";
 				if (!("mode" in props || "position" in props || "animate" in props)) {
 					return;
 				}

tests/unit/SidePane.js

@@ -15,14 +15,13 @@ define([
 			origBodyStyle = document.body.style.cssText;
 			node = new SidePane();
 			document.body.appendChild(node);
-			register.parse();
 			node.show();
 		},
 		"Default values" : function () {
-			assert.deepEqual(node.mode, "push");
-			assert.deepEqual(node.position, "start");
-			assert.deepEqual(node.animate, true);
-			assert.deepEqual(node.swipeClosing, true);
+			assert.strictEqual(node.mode, "push");
+			assert.strictEqual(node.position, "start");
+			assert.isTrue(node.animate, "node.animate");
+			assert.isTrue(node.swipeClosing, "node.swipeClosing");
 		},
 		"Size Computation" : function () {
 			var box = domGeom.getMarginBox(node);