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CSS for hide/show columns closing the complete browser window

we are using below CSS for hide/show columns in the Dhtmlx grid,
when we access the grid, it is closing the complete browser window. please help me in this.


.dhx_header_cmenu{
            overflow-y:auto !important;
            height:100px !important; // <= necessary height value here
        }

Problem can't be reconstructed locally.
The sample with same code snippet works correctly in all tested browsers.
Working sample sent by email.