Hi,
When you run the LoginDialog example ( after your errors are fixed), you get first prompted with a dialog box. There will be one section for entering room url, one for your login and one for your password. Those fields will have some junk default value and you would need to remove that and enter your credentials.
Coming back to your error, when the latest Flex SDK with spark components were released, they removed some of the border style properties from the mx component set. That’s why you are getting those errors( I am sure you are using latest Flash Builder and Flex 4.0). You can do two things to fix it
a)Remove those border styles. I am attaching an updated file with those removed. You can use it directly.
b) In case you are only going to use mx components in your project, then you can go to Project->Properties->Flex Build Path->Library Path tab and there you will see the radiobutton "Mx+Spark" is selected by default. You can select "MX only" button instead. But remember, doing so will restrict you from using any spark component. So, best will be to go with option a.
Hope this helps
Thanks
Hironmay Basu