After the height of the table percentage no scroll bars appear incomplete

<?page title="new page title" contentType="text/html;charset=UTF-8"?> <zk> <window title="new page title" border="normal" height="500px"> <grid width="400px" height="100%" > <columns> <column label="column1"/> <column label="column2"/> </columns> <rows> <row> <label value="1就来得及时了搜到叫dd"></label> <label value="1就来得及时了搜到叫dd"></label> </row> <row> <label value="2就来得及时了搜到叫dd"></label> <label value="2就来得及时了搜到叫dd"></label> </row> <row> <label value="3就来得及时了搜到叫dd"></label> <label value="3就来得及时了搜到叫dd"></label> </row> <row> <label value="4就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="5就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="6就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="7就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="8就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="9就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="10就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="11就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="12就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="13就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="14就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> <row> <label value="15就来得及时了搜到叫dd"></label> <label value="就来得及时了搜到叫dd"></label> </row> </rows> </grid> </window> </zk>