A part of the label "Column 2 LONG TEST" is hidden.

Test code:
<grid width="210px">
<columns>
<column width="70px" label="Column 1"/>
<column width="70px" label="Column 2 LONG TEST"/>
<column width="70px" label="Column 3"/>
</columns>
<rows>
<row>
<label value="String 1"/>
<label/>
<label/>
</row>
<row>
<label value="String 2"/>
<label/>
<label/>
</row>
</rows>
</grid>

Workaround:
<zk>
<style>
DIV.z-column-cnt {
white-space: normal;
}
</style>
...
</zk>