Why there is space on head of WebViewer

Hello Dev’s ,
i am creating something in which i have to use WebViewer to display my web blog.
for that i have use just webviewer and put my URL in it, and it works.
But, there is problem of Some space on head of WebViewer. ( Screeshot attached of Blank space ).
i use verticle arrangement then. Height and width are set to Fill parent ( later tried automatic too ). and put webviewer in it. but it wont work.
webviewer also set at Fill parent for height and width.
Please help me out.

17 posts were merged into an existing topic: Space at the top of webview after new release