leftWidth

This property is used for only combo colomn.
leftWidth is width of left side of combo editor.
This property can be used only if property leftTpl is defined.

This property is used for advanced templating combo.
Templating combos is one the most complex issue.

Example

columns: [{
  index: 'country',
  title: 'Country',
  type: 'combo',
  displayKey: 'text',
  valueKey: 'text',
  minEditorWidth: 150,
  minListWidth: 150,
  leftTpl: '<span class="flag {cls}"></span> l ',
  leftWidth: 35,
  listItemTpl: '<span class="flag {cls}"></span> <span class="country">{text}</span>',
  render: function(o){
	var cls = 'flag-' + coutries[o.value];
	
	o.value = '<span class="flag ' + cls + '"></span> <span class="country">' + o.value + '</span>';
	return o;
  },
  data: {
	proxy: {
	  url: 'countries.json'
	}
  }
},{
...

Default

20