The 'openNewWin' property does not hold a valid Function object and is either null or undefined

I am currently working with an asp menu and trying to configure the navigateurl so that it opens in a new popup window. The issue I am facing is that when I execute the code, I encounter the following error:

Error: The value of the property 'openNewWin' is null or undefined, not a Function object

Furthermore, in the address bar, I see this:

javascript:openNewWin('/Controls/Financial/CustomerTypes.aspx')

Below is the snippet of code where I set the URL:

foreach (DataRowView childView in viewItem) 
{
   MenuItem childItem = new MenuItem(childView["MenuName"].ToString(), childView["MenuId"].ToString());

  //childItem.NavigateUrl = childView["MenuUrl"].ToString();
  childItem.NavigateUrl = "javascript:openNewWin('" + childView["MenuUrl"].ToString() + "')";

  menuItem.ChildItems.Add(childItem);
  AddChildItems(table, childItem);

}

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