Cacher des parties de mon repeater .

  <asp:Repeater ID="liste_app" runat="server" OnItemCommand="_liste_app_ItemCommand">
            <ItemTemplate>
                <table>
                    <tr id='<%# Databinder.Eval(Container.DataItem,"APP_ID","tr_app{0}" ) %>'>
                        <td width="350" style="color: red">
                            <asp:Label ID="app_libelle" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "APP_LIBELLE")%> '> </asp:Label>
                            <asp:Label ID="app_id" runat="server" Visible="false" Text='<%#DataBinder.Eval(Container.DataItem, "APP_ID")%> '></asp:Label>
                            <asp:ImageButton Style="color: Black" runat="server" ID="link_app" ImageUrl="~/Images/moinsapp.bmp" />
                            </asp:ImageButton>
                        </td>
                    </tr>
                    <tr bgcolor="#ffffc0">
                        <td width="350">
                            <asp:Label ID="grp_admin" runat="server" Visible="false" Text='<%#DataBinder.Eval(Container.DataItem, "GRP_ADMIN")%> '></asp:Label>
                            <asp:ImageButton Style="color: Black" runat="server" ID="link_grp" ImageUrl="~/Images/moinsgrp.bmp">
                            </asp:ImageButton>
                            <asp:Label ID="grp_libelle" runat="server" Text=' <%#DataBinder.Eval(Container.DataItem, "GRP_LIBELLE")%>  '></asp:Label>
                            <asp:Label ID="grp_id" runat="server" Visible="false" Text='<%#DataBinder.Eval(Container.DataItem, "GRP_ID")%> '></asp:Label>
                            <asp:ImageButton ID="admin_btn" Visible="false" runat="server" ImageUrl="~/Images/admin_btn.bmp" />
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <asp:Image ID="noinfo" runat="server" Visible="false" ImageUrl="~/Images/noinfo.bmp" />
                            <asp:ImageButton ID="info_btn" runat="server" Visible="false" ImageUrl="~/Images/info.bmp" />
                            <asp:HyperLink Style="color: Black" runat="server" ID="fic_libelle" NavigateUrl='<%#DataBinder.Eval(Container.DataItem, "FIC_LIEN")%> '
                                Text='<%#DataBinder.Eval(Container.DataItem, "FIC_LIBELLE")%> '></asp:HyperLink>
                            <asp:Label ID="fic_info" runat="server" Visible="false" Text='<%#DataBinder.Eval(Container.DataItem, "FIC_INFO")%> '></asp:Label>
                            <asp:Label ID="fic_id" runat="server" Visible="false" Text='<%#DataBinder.Eval(Container.DataItem, "FIC_ID")%> '></asp:Label>
                        </td>
                    </tr>
                </table>
            </ItemTemplate>
        </asp:Repeater>

<asp:ImageButton Style="color: Black" runat="server" ID="link_app" ImageUrl="~/Images/moinsapp.bmp" OnClick="link_grp_Click"/></asp:ImageButton>

Protected Sub liste_app_ItemCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles liste_app.ItemCreated
  If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
    e.Item.ID = "Ligne_" & e.Item.ItemIndex
  End If
End Sub


Protected Sub link_grp_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs)
	'MsgBox(sender.uniqueID)
	Dim lig As RepeaterItem = Page.FindControl(sender.uniqueID.replace("$link_grp", ""))
	lig.Visible = False
End Sub

        <asp:Repeater runat="server" ID="rptPouet" OnItemCommand="rptPouet_ItemCommand">
            <HeaderTemplate><ul></HeaderTemplate>
            <FooterTemplate></ul></FooterTemplate>
            <ItemTemplate>
                <li>
                    <%#((Person)Container.DataItem).ToString() %>
                    <asp:ImageButton runat="server" CommandName="Foo" CommandArgument="<%#((Person)Container.DataItem).PersonId %>" ImageUrl="~/images/foo.png" />
                </li>
            </ItemTemplate>
        </asp:Repeater>
        <asp:label runat="server" ID="lblTest" />

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public class Person
{
    public int PersonId { get; set; }
    public String FirstName { get; set; }
    public String LastName { get; set; }

    public override string ToString()
    {
        return String.Format("{0} {1}", this.FirstName, this.LastName);
    }
}

public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            this.BindData();
        }
    }

    protected void rptPouet_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        this.lblTest.Text = String.Format("CommandName = {0} ; CommandArgument = {1}", e.CommandName, e.CommandArgument);
    }

    private void BindData()
    {

        Person[] persons = new Person[]{ 
            new Person(){ FirstName ="firstName1", LastName="lastName1", PersonId= 1}, 
            new Person(){ FirstName ="firstName2", LastName="lastName2", PersonId= 2}
        };

        this.rptPouet.DataSource = persons;
        this.rptPouet.DataBind();
    }
}