or
.NormalMenuItem{ /*background-color: red !important;*/ background-image: url(../Images/headerNormal.png) !important; background-size: 100% 35px;}.NormalMenuItem:hover{ /*color: red !important; background-color: white !important;*/ background-image: url(../Images/headerHover.png) !important; background-size: 100% 35px;}.SelectedMenuItem{ /*background-color: purple !important;*/ background-image: url(../Images/headerActive.png) !important; background-size: 100% 35px;}DataTable mnuDT = new DataTable();mnuDT.Columns.Add("Section");mnuDT.Rows.Add("Employees");mnuDT.Rows.Add("Projects");mnuDT.Rows.Add("Customers");Telerik.Web.UI.RadMenuItem homeRmi = new Telerik.Web.UI.RadMenuItem();homeRmi.Text = "Home";homeRmi.CssClass = "NormalMenuItem";homeRmi.ClickedCssClass = "SelectedMenuItem";homeRmi.SelectedCssClass = "SelectedMenuItem";homeRmi.Selected = true;rmMain.Items.Add(homeRmi);for(int i = 0; i < mnuDT.Rows.Count; i++){ Telerik.Web.UI.RadMenuItem rmi = new Telerik.Web.UI.RadMenuItem(); rmi.Text = mnuDT.Rows[i].ItemArray[0].ToString(); rmi.CssClass = "NormalMenuItem"; rmi.ClickedCssClass = "SelectedMenuItem"; rmi.SelectedCssClass = "SelectedMenuItem"; rmMain.Items.Add(rmi);}<telerik:RadMenu ID="rmMain" runat="server" onitemclick="rmMain_ItemClick"></telerik:RadMenu>protected void ddtDiagCategorie_OnNodeDataBound(object sender, DropDownTreeNodeDataBoundEventArguments e) { if (BilletCourant != null && BilletCourant.IdCategorie.HasValue) { if (e.DropDownTreeNode.Value.Equals(BilletCourant.IdCategorie.Value.ToString())) { e.DropDownTreeNode.CreateEntry(); } } //ExpandAllNodes sur ce contrôle e.DropDownTreeNode.Expanded = true; }