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DataBinding部分，以查看可配置值。
Child Tags is an optional section that may be added to a tag in a library definition.
ChildTags是一个可以向库定义中标签添加的可选部分。
Find the Tomahawk command button tag in the library definition editor and open the tag Attributes section to see the list of attribute names.
在库定义编辑器中找到Tomahawk命令按钮标签，并打开TagAttributes部分以查看属性名的列表。
Go back to the library definition editor for Tomahawk and find the column tag.
转回至tomahawk的库定义编辑器，并找到column标签。
Open the Tomahawk library definition and go to the Drop Properties section for the column tag.
打开tomahawk库定义并转至column标签的DropProperties部分。
Open the library definition editor and select the Tag library section.
打开库定义编辑器，并选择Tag Library部分。
You will now explore other modifications to the Tomahawk library definition that affect the tool behavior on a tag-by-tag basis.
现在探讨对tomahawk库定义所做的其他更改，该库定义会影响到标签基础上的工具行为。
You will now explore other modifications to the Tomahawk library definition that affect the tool behavior on a tag-by-tag basis.
现在探讨对tomahawk库定义所做的其他更改，该库定义会影响到标签基础上的工具行为。
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