Can' click into editor inside tabstrip

Hi Guys,

I put an editor inside tabstrip, but I cannot click inside the edit area. If I move it out of tabstrip it works perfectly.

The format, font-family, and font-size dropdowns can be clicked, and they work, but the html source code editor, and image browser won't pop-up.

Any idea why this happens?

I am using Kendo 2015 summer release.

Best Wishes,

Matt