This occurred because the wizard that created the library definition cannot tell what the column tag represents, so it defaulted to prevent child tags inside a column.
之所以会发生这种情况，是因为创建库定义的向导不能识别列标签的代表意义，所以默认条件下系统会阻止子标签进入列中。
Like many other configuration elements in the library definition, the values of these check boxes are set when the wizard initially inspects a tag library.
像库定义中的许多其他配置元素一样，这些复选框会在向导开始检查标签库时得到设置。
Find the commandButton tag in the library definition and open the Data Binding section to look at the configurable values.
在库定义中找到命令按钮标签，并打开Data Binding部分，以查看可配置值。
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