ColumnSet

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1.	表头虽然可以创建多个表头（columnset），然后可以指定每个元素占用多少个格子，但不能动态修改。比如3*3的grid，一个元素 … blog.sina.com.cn\|Based on 1 page

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AllAll,表头表头

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Column sets have to part of a table 's original design . If a table has any sparse columns in it, a column set cannot be added.

Once the table has columnset defined , the select * will hide all sparse columns , and only see the column set.