Required library edition:
Required library file: dhtmlxgrid.js

set minimum column width (works only for manual resizing)

• width - minimum column width, can be set for specified column, or as comma separated list for all columns
• ind - column index

   //set first column min width
   mygrid.setColumnMinWidth(50,0);
   //set columns min widths
   mygrid.setColumnMinWidth("50,100,100,150,200,100,150");

See also: enableAutoWidth, setColWidth