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i am using co|coro excell . How do i auto-resize in this case?

The width of editor limited by width of existing cell, it is hardcoded and can't be changed automatically.

dhtmlxgridcell.js, line 940

        this.list=document.createElement("SELECT");
        this.list.className='dhx_combo_select';
        this.list.style.width=this.cell.offsetWidth+"px";   // here it is!
   
You can change this place in code in any necessary way.