Hiding headers

Hello, I have datatable which have multiline headers and facing problem with hiding columns. when ever I hide first column by using Hidecolumns() then it hides top level header also and this top level header is group header . Don’t want to hide top level headers. Is there any solution to this ?

And addition to above information this reproduces only for first column and not any other columns. If I hide second column then header is remains intact.
Thanks

Any suggestions ??

It looks as the same case as described here

http://forum.webix.com/discussion/3001/common-header-for-cell-that-can-not-be-hidden-by-hiding-any-of-cell#Item_2

You can’t prevent column hiding, but you can create a separate column for such persistent header.