Retrieve the focus on the current image on datalist

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C#

ASP.NET4

when the mouse hovers over the image, it changes opacity (and ok)

when i click an image (.CSSImageButton:active) change color, but at the same time he loses focus (effect .CSSImageButton)

the objective is to report the focus on the image after the click

this has no effect because CSS verifies the loss of focus

 protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {      
        DataList1.SelectedIndex = e.Item.ItemIndex;
     
        Image1.BorderStyle = BorderStyle.Ridge;
        Image1.BorderColor = System.Drawing.Color.DarkBlue;

        //get the current index
        DataList1.SelectedIndex = e.Item.ItemIndex;

       // ???? is possible to set the focus on curentItem ......
}

What I have tried:

CSS style

.CCSImageButton:hover
{      
   border-width:5px;
   border-color: yellow; 
   border-style:ridge;
   opacity : 1;
}

.CCSImageButton
{  
   border-width:2px;
   border-style:groove;
   opacity : 0.5;
} 
.CCSImageButton:active
{
   border-width:5px;
   border-color: red; 
   border-style:ridge;
   opacity : 1;
}

DataList

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
             <ContentTemplate>
               <asp:DataList ID="DataList1" runat="server" RepeatDirection="Horizontal" RepeatLayout="Table" RepeatColumns="0" SeparatorStyle-HorizontalAlign="NotSet" SelectedItemStyle-Wrap="False" SelectedItemStyle-HorizontalAlign="NotSet" HorizontalAlign="NotSet" ItemStyle-HorizontalAlign="NotSet" FooterStyle-Wrap="False" OnItemCommand="DataList1_ItemCommand">
                 
                 <ItemTemplate>
                    <td>                                       
                     <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl='<%# Eval("thumbs") %>' Height="150px" OnClick="ImageButton1_Click" ImageAlign="Middle" EnableTheming="False" CssClass="CCSImageButton" />
                     asp:Label ID="Label1" runat="server" Text=' <%# Eval("descrizione") %>' Visible="true"></asp:Label>                           
                      <asp:Label ID="Label3" runat="server" Text=' <%# Eval("fullimage") %>' Visible="false"></asp:Label> 
                    </td>
                  </ItemTemplate>
                 </asp:DataList>
              </ContentTemplate>             
            </asp:UpdatePanel>