Polymer <paper-tabs> got clashing in <core-pages>

[ilhamfadllah]

I got clashing view, when using paper-tabs into core-pages. So the issue like the images below:

When i chaged to the other section, the clash has occured:

I have tried to arranged by javascript, but it doesn,t work.

Thanks in advance

[ilhamfadllah]

Can you help me, Mr. @robdodson

[robdodson]

It's really hard to say without seeing the markup. Are you able to create a jsbin to demonstrate the problem?

[robdodson]

Also, it might be better to ask this question over on StackOverflow. I don't think this is a bug in the tutorial, but more a question about how to implement a feature in your app.