Este es mi código aspx, de momento.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="frmGestionIncendios.aspx.cs" Inherits="Paginas_Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Página sin título</title>
<script language="javascript" src="../JScript/FunVentanas.js" type="text/javascript"></script>
<script language="javascript" src="../JScript/Utilidades.js" type="text/javascript"></script>
<script type="text/javascript">
function Dimensionar()
{
DivCentral.style.width = document.getElementById("GestionIncendios").style.width - document.getElementById("DivIncendios").style.width - document.getElementById("DivBases").style.width;
}
</script>
</head>
<!--
<body onresize=PosicionaDivsGestionIncendios(DivIncendios,DivCentral,DivBases);>
-->
<body>
<form id="GestionIncendios" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"
EnablePartialRendering="True" />
<!--CABECERA-->
<div runat="server" id="CIzda" style="float:left; width:48%; height: 70px;"
align="left">
<asp:ImageButton runat="server"
ID="ImageButton2" AlternateText="Nuevo Incendio" BorderStyle="Solid"
ImageUrl="~/Imagenes/llama03.ico" ToolTip="Nuevo Incendio"></asp:ImageButton>
</div>
<div runat="server" id="CDcha"
style="float:left; top:0px; width:50%; height: 70px;" align="right">
<asp:ImageButton ID="btnAsignarMedioIncendio" runat="server"
AlternateText="Asignar Medio al Incendio" BorderStyle="Solid"
ImageUrl="~/Imagenes/Foca.ico"
onclick="btnAsignarMedioIncendio_Click" />
</div>
<!--CUERPO CENTRAL-->
<div>
<div runat="server" id="DivIncendios"
style="float:left; width:20%; background-color:#D4E6EA; clear: both;"
align="left">
<asp:UpdatePanel ID="UpdatePanelIncendios" runat="server"
UpdateMode="Conditional">
<ContentTemplate>
<asp:TreeView ID="tvwIncendios" runat="server" NodeIndent="10" ShowCheckBoxes="Parent"
ToolTip="Incendios y medios asignados" ShowLines="True"
ontreenodecheckchanged="tvwIncendios_TreeNodeCheckChange">
<ParentNodeStyle Font-Bold="True" Font-Names="Arial Narrow" Font-Size="Large" />
<LevelStyles>
<asp:TreeNodeStyle Font-Names="Arial Narrow" Font-Size="Medium"
Font-Underline="False" />
</LevelStyles>
<RootNodeStyle Font-Bold="True" Font-Names="Arial Narrow" Font-Size="20pt" />
<NodeStyle Font-Bold="False" HorizontalPadding="10px" />
<LeafNodeStyle Font-Names="Arial Narrow" Font-Size="Small" />
</asp:TreeView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TimerIncendios" EventName="Tick" />
<asp:AsyncPostBackTrigger ControlID="tvwIncendios"
EventName="TreeNodeCheckChanged" />
</Triggers>
</asp:UpdatePanel>
</div>
<div runat="server" id="DivCentral"
style="width: 520px; background-color:Yellow; height: 500px; float: left;">
<asp:MultiView ID="mvwCentral" runat="server">
<asp:View ID="vwAsignarMedioAMision" runat="server" EnableTheming="False">
<table style="width:100%; font-family: Arial; font-size: medium; color: #0000FF;">
<tr>
<td style="font-family: Arial; font-size: medium">
MEDIO</td>
<td>
MISIÓN</td>
<td>
</td>
</tr>
<tr>
<td>
<asp:ListBox ID="lstMedios" runat="server"></asp:ListBox>
</td>
<td>
<asp:ListBox ID="lstMision" runat="server"></asp:ListBox>
</td>
<td>
</td>
</tr>
<tr>
<td>
<asp:ImageButton ID="btnAceptar" runat="server" AlternateText="Aceptar"
ImageUrl="~/Imagenes/accept.png" />
<asp:ImageButton ID="btnCancelar" runat="server" AlternateText="Cancelar"
ImageUrl="~/Imagenes/delete.png" />
</td>
<td>
</td>
<td>
</td>
</tr>
</table>
</asp:View>
<asp:View ID="vwBase" runat="server">
</asp:View>
<asp:View ID="vwMedioAereo" runat="server">
</asp:View>
<asp:View ID="vwMedioTerrestre" runat="server">
</asp:View>
<asp:View ID="vwBrigada" runat="server">
</asp:View>
</asp:MultiView>
</div>
<div runat="server" id="DivBases"
style="float:right; width:20%; background-color:#D4E6EA;">
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TreeView ID="tvwBases" runat="server" NodeIndent="10" ShowCheckBoxes="Leaf"
ToolTip="Bases y medios"
onselectednodechanged="tvwBases_SelectedNodeChanged"
ontreenodecheckchanged="tvwBases_TreeNodeCheckChanged">
<ParentNodeStyle Font-Bold="True" Font-Names="Arial Narrow" Font-Size="Large" />
<LevelStyles>
<asp:TreeNodeStyle Font-Names="Arial Narrow" Font-Size="Medium"
Font-Underline="False" />
</LevelStyles>
<RootNodeStyle Font-Bold="True" Font-Names="Arial Narrow" Font-Size="20pt"
Font-Italic="False" Font-Strikeout="False" />
<NodeStyle HorizontalPadding="10px" Font-Bold="False" />
<LeafNodeStyle Font-Bold="False" Font-Names="Arial Narrow"
Font-Overline="False" Font-Size="Small" Font-Strikeout="False" />
</asp:TreeView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TimerBases" EventName="Tick" />
<asp:AsyncPostBackTrigger ControlID="tvwBases"
EventName="TreeNodeCheckChanged" />
</Triggers>
</asp:UpdatePanel>
</div>
</div>
<!--PIE-->
<div id="DivNoticias" style="background-color:Teal; clear:left; width: 100%; position:absolute; height:20px; border: solid 1px red;" runat="server">
<asp:UpdatePanel ID="UpdatePanelNoticias" runat="server">
</asp:UpdatePanel>
</div>
</div>
<asp:Timer ID="TimerBases" runat="server" Interval="10000"
ontick="TimerBases_Tick">
</asp:Timer>
<asp:Timer ID="TimerIncendios" runat="server" Interval="10000"
ontick="TimerIncendios_Tick">
</asp:Timer>
</form>
</body>
</html>