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Disable sorting when using complex content in header.

Hi, Support.

I'm using complex context in header as shown in this example:
http://dhtmlx.com/docs/products/dhtmlxGrid/samples/header_footer/grid_complexheader_content.html

But the problem is when clicking on Header near textbox (below 'Title") in example above, the column is sorted and sorting image appears near the text box.

How can I prevent it? The sorting should be enabled, but only when clicking on top part of the header.

I'm using custom sorting function:
mygrid.attachEvent("onBeforeSorting",customColumnSort);
but I can't check where click was made: in top part of the header or bottom...

Thanks a lot
Shurik

Please check this article http://www.dhtmlx.com/docs/products/kb/index.shtml?cat=kb&q=2433&ssr=yes&s=smart%20rendering%20multiline)

Thank you for answer, but it don't solve my problem, the problem is other:
I don't want to replace image or disable sorting at all for the column. The sorting should be enabled, but only when clicking on top part of the muli-row header.

The only way to block sorting for some row of grid - stop native onclick event on it. 

mygrid.hdr.rows[INDEX].onclick=function(e){ (e||event).cancelBubble=true;  }

where INDEX - index of row in header ( 1-based ) 

Support! You are great!
Exactly what I need.

Thanks a lot!