I am using Jquery Mobile version

jquery.mobile-1.0a2.min.js

and Jquery Version jquery-1.4.3.min.js

If i add the select box control (as a text html) dynamically to the screen while using JQuery Mobile, then it gives me following error

TypeError: Result of expression 'd[0].options' [undefined] is not an object.

This is the code that i used

<script>
			$(document).ready(function(){
				addComboBox();
			});

			function addComboBox()
			{
				var contentHTML = "";
				contentHTML += "<div data-role='fieldcontain'>";	
				contentHTML += "<label for='categories' class='select'></label>";	
				contentHTML += "<select id='categories' name='categories'>";	
				//contentHTML += "<optgroup label='TEXT.SHPLST_LI_SL'>";
				contentHTML += "<option value ='_allSavedItems'>";
				contentHTML += "TEXT.SHPLST_LI_ALL_ITEMS";
				contentHTML += "</option>";
				
				for (var i=0; i < 10; i++)
				{
					contentHTML += "<option value ='" + i + "'>";
					contentHTML += i;
					contentHTML += "</option>";
				}
				//contentHTML += "</optgroup>";
				contentHTML += "</select></div>";	
				$("#toolbar").append( contentHTML ).selectmenu();
			}
		</script>