[#list this.children as column] [#if (column_index > 0)]
[/#if] [/#list] [#list this.children as column]
${column.label}
[/#list]
[#list 1..(this.children?size-1) as i]
[/#list]
[#list this.iterator as item]
[#list this.children as column] ${column.render()} [/#list]
[/#list]