Can't seem to set row height for my gridview control

Here's my ASP:
     <asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateEditButton="true"         DataSourceID="AccessDataSource1"         AutoGenerateColumns="False" DataKeyNames="ID"         AlternatingRowStyle-BackColor="Gray"         RowStyle-Height="400px"         RowStyle-VerticalAlign="Top">                  <Columns>             <asp:CommandField ShowSelectButton="True" />             <asp:BoundFi ...