CommandFieldShowEditButton.aspx font size:
<html>
<title>CommandField ShowEditButton Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>CommandField <span class="hilite">ShowEditButton</span> Example</h2></div>
<hr size=1 width=92%>

<form runat="server">
<div align="center">

   <asp:detailsview id="guestDetails" runat="server"
      width=75% cellpadding=5
      datasourceid="guests"
      datakeynames="GuestID"
      allowpaging
      autogeneraterows=false>

      <rowstyle
         backcolor="ghostwhite"
         verticalalign="top" />
      <commandrowstyle font-bold
         horizontalalign="center" />
      <fieldheaderstyle width=30%
         backcolor="lightsteelblue"
         horizontalalign="right" />

      <fields>

         <asp:boundfield datafield="guestid"
            headertext="Guest ID"
            readonly="true" />

         <asp:boundfield datafield="nickname"
            headertext="Nickname" />

         <asp:templatefield headertext="Gender">
            <itemtemplate>
               <asp:label id="genderlabel" runat="server"
                  text='<%# Eval ( "gender" ) %>' />
            </itemtemplate>
            <edititemtemplate>
               <asp:radiobuttonlist id="editgender" runat="server"
                     repeatdirection="horizontal"
                     selectedvalue='<%# Bind ( "gender" ) %>'>
                  <asp:listitem value="M" text="Male" />
                  <asp:listitem value="F" text="Female" />
                  <asp:listitem value="" text="No Comment" />
               </asp:radiobuttonlist>
            </edititemtemplate>
         </asp:templatefield>

         <asp:templatefield headertext="State">
            <itemtemplate>
               <asp:label id="statelabel" runat="server"
                  text='<%# Eval ( "state" ) %>' />
            </itemtemplate>
            <edititemtemplate>
               <asp:dropdownlist id="editstate" runat="server"
                  datasourceid="states"
                  datatextfield="state"
                  datavaluefield="stateid"
                  selectedvalue='<%# Bind ( "state" ) %>' />
            </edititemtemplate>
         </asp:templatefield>

         <asp:templatefield headertext="Lucky Date">
            <itemtemplate>
               <asp:label id="luckydatelabel" runat="server"
                  text='<%# Eval ( "luckydate", "{0:d}" ) %>' />
            </itemtemplate>
            <edititemtemplate>
               <asp:calendar id="editluckydatecalendar" runat="server"
                  backcolor="khaki"
                  titlestyle-backcolor="yellowgreen"
                  selecteddaystyle-backcolor="sienna"
                  visibledate='<%# Eval ( "luckydate" ) %>'
                  selecteddate='<%# Bind ( "luckydate" ) %>' />
            </edititemtemplate>
         </asp:templatefield>

         <asp:checkboxfield datafield="married"
            headertext="Married?" />

         <asp:commandfield showeditbutton
            buttontype="image"
            editimageurl="~/shared/images/button_edit.gif"
            cancelimageurl="~/shared/images/button_cancel.gif"
            updateimageurl="~/shared/images/button_update.gif" />

      </fields>

      <emptydatatemplate>
         <center>
            <p id="msg">There seems to be a problem.<br>
               Some whacko must have deleted all the existing records. <img src="/shared/biggrin.gif" width="15" height="15" border="0" alt=""></p>

            <p><a href="/admin/add_guests.aspx">Add Sample Data</a></p>
         </center>
      </emptydatatemplate>

   </asp:detailsview>

   <asp:sqldatasource id="guests" runat="server"
      selectcommand="SELECT * FROM aspx_guests"
      updatecommand="UPDATE aspx_guests SET
         Nickname=@Nickname, Gender=@Gender, 
         LuckyDate=@LuckyDate, State=@State, Married=@Married
         WHERE GuestId=@GuestId"
      connectionstring="<%$ ConnectionStrings:aspnet %>" />

   <asp:accessdatasource id="states" runat="server"
      datafile="~/app_data/usa.mdb"
      datasourcemode="datareader"
      selectcommand="SELECT State, StateId FROM States" />

</div>
</form>

<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>