ASP.NET 3.5 Gridview control - asp.net

Question

If you click on the 'search' button in the following link
link text
A gridview shows up. I am trying to do something similar within a table whose width is set to auto. My current way is to create the gridview in design view, but however, my gridview does not resize to the table width. I understand that I posed 2 different questions in one.
My current gridview is as such. Defined in 'source' view
<asp:GridView ID="gridView" runat="server"
AutoGenerateColumns="False"
EnableSortingAndPagingCallbacks="True"
AllowPaging="True" DataSourceID="FilesByJobObjectDataSource"
PageSize="5" OnRowCommand="gridView_RowCommand" DataKeyNames="FileID"
HorizontalAlign="Left" >
<Columns>
<asp:BoundField DataField="RID" HeaderText="RID"
ReadOnly="True" ItemStyle-Width="50px" >
<ItemStyle Width="50px" />
</asp:BoundField>
<asp:BoundField DataField="Category" HeaderText="Category"
ReadOnly="True" ItemStyle-Width="100 px" >
<ItemStyle Width="100px" />
</asp:BoundField>
<asp:BoundField DataField="FileName" HeaderText="Type"
ReadOnly="True" ItemStyle-Width="575 px" >
<ItemStyle Width="575px" />
</asp:BoundField>
<asp:BoundField DataField="FileID" Visible="false" />
<asp:ButtonField Text="X" ButtonType="Button" ItemStyle-Width="20px" >
<ItemStyle Width="20px" />
</asp:ButtonField>
</Columns>
<RowStyle CssClass="RowStyle" />
<EmptyDataRowStyle CssClass="EmptyRowStyle" />
<PagerStyle CssClass="PagerStyle" />
<SelectedRowStyle CssClass="SelectedRowStyle" />
<HeaderStyle CssClass="HeaderStyle" />
<EditRowStyle CssClass="EditRowStyle" />
<AlternatingRowStyle CssClass="AltRowStyle" />
</asp:GridView>
</ContentTemplate>

Answer 1

Don't set the column widths....