排序之前，第4行是展开的，树型网格记住了这个状态。
Before the sorting action, the fourth row is expanded and the tree grid remembered it.
创建一个定制的网格编辑器来返回针对所选行的选项。
Create a custom grid select editor to return the options for a selected row.
写一个四行四列的小网格绘制的程序。
Write a function that draws a similar grid with four rows and four columns.
定义由行和列组成的灵活的网格区域。
Defines a flexible grid area that consists of columns and rows.
定义由行和列组成的灵活的网格区域。
Defines a flexible grid area that consists of columns and rows.
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