docs: function() {
  			var wrapStr = '',headerShowStr = '';
  			if(!this.options.showHeader)
  				headerShowStr = 'style="display:none;"';
  			var htmlStr = '<div class="u-grid-header" id="' + this.options.id + '_header" ' + headerShowStr + '><div class="u-grid-header-wrap" id="' + this.options.id + '_header_wrap" data-role="resizable" ' + wrapStr + '>';
  			htmlStr += '<div class="u-grid-header-columnmenu fa fa-bars"></div>';
  			if (this.options.multiSelect || this.options.showNumCol) {
  				htmlStr += '<div id="' + this.options.id + '_header_left" class="u-grid-header-left" style="width:' + this.leftW + 'px;">';
  				if (this.options.multiSelect) {
  					if(gridBrowser.isIE8){
  						//htmlStr += '<div class="u-grid-header-multi-select" style="width:' + this.multiWidth + 'px;"><input class="u-grid-multi-input"   type="checkbox" id="' + this.options.id + '_header_multi_input"></div>'
  						htmlStr += '<div class="u-grid-header-multi-select" style="width:' + this.multiWidth + 'px;"><span class="u-grid-checkbox-outline" id="' + this.options.id + '_header_multi_input"><span class="u-grid-checkbox-tick-outline"></span></span></div>'
  						
  					}else{
  						//htmlStr += '<div class="u-grid-header-multi-select  checkbox check-success" style="width:' + this.multiWidth + 'px;"><input  class="u-grid-multi-input"  type="checkbox" id="' + this.options.id + '_header_multi_input"><label for="' + this.options.id + '_header_multi_input"></label></div>'
  						htmlStr += '<div class="u-grid-header-multi-select  checkbox check-success" style="width:' + this.multiWidth + 'px;"><span class="u-grid-checkbox-outline" id="' + this.options.id + '_header_multi_input"><span class="u-grid-checkbox-tick-outline"></span></span></div>'
  					}
  				}
  				if (this.options.showNumCol) {
  					htmlStr += '<div class="u-grid-header-num" style="width:' + this.numWidth + 'px;"></div>';
  				}
  				htmlStr += '</div>';
  			}
  			htmlStr += this.createHeaderTableFixed();
  			htmlStr += this.createHeaderTable();
  			htmlStr += '</div>';
  			htmlStr += this.createHeaderDrag();;
  			htmlStr += '</div>';
  			return htmlStr;
  		}