Found an ugly bug I think.
Took a little while to set up a test page to show this too.
Looks like it also shows up only in MSIE but FF has no issues. I searched for "nodetype is null" in your forum and found one other instance of it, but it had to do with your panel.
Mouse off and onto the start/end date field multiple times to reproduce this...it's intermittent which is why I didn't notice it before...I happened to move my mouse over the toolbar and saw it.
Error msg:
====================
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; T312461; GTB6; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MS-RTC LM 8)
Timestamp: Mon, 16 Nov 2009 17:00:19 UTC
Message: 'nodeType' is null or not an object
Line: 6
Char: 17366
Code: 0
URI: http://localhost/SkyServe/eo_web.ashx?id=cec5e289-0512-4015-a73f-4e3d9064f315
====================
Sample code:
====================
<%@ Page Language="C#" %>
<%@ Register Assembly="EO.Web" Namespace="EO.Web" TagPrefix="eo" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
System.Web.UI.Control customStartItem = ToolBar1.Items[0].CustomItemInstance;
System.Web.UI.Control customEndItem = ToolBar1.Items[1].CustomItemInstance;
System.Web.UI.Control customOtherItem = ToolBar1.Items[2].CustomItemInstance;
System.Web.UI.WebControls.TextBox
txtStartDate = (System.Web.UI.WebControls.TextBox)customStartItem.FindControl("txtStartDate");
System.Web.UI.WebControls.TextBox
txtEndDate = (System.Web.UI.WebControls.TextBox)customEndItem.FindControl("txtEndDate");
DropDownList Timespan = (DropDownList)customOtherItem.FindControl("Timespan");
Image imgStartSel = (Image)customStartItem.FindControl("imgStartSel");
Image imgEndSel = (Image)customEndItem.FindControl("imgEndSel");
txtStartDate.Text = DateTime.Now.ToString();
txtEndDate.Text = DateTime.Now.ToString();
imgStartSel.Visible = false;
imgEndSel.Visible = false;
ToolBar1.FindItem("Graph").Visible = false;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<eo:ToolBar id="ToolBar1"
SeparatorImage="00100204" BackgroundImage="00100203"
Width="100%" BackgroundImageRight="00100202" runat="server">
<DownStyle CssText="BORDER-RIGHT: #335ea8 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #335ea8 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 12px; PADDING-BOTTOM: 1px; BORDER-LEFT: #335ea8 1px solid; CURSOR: hand; PADDING-TOP: 3px; BORDER-BOTTOM: #335ea8 1px solid; FONT-FAMILY: Tahoma; BACKGROUND-COLOR: #ffe1ac"></DownStyle>
<HoverStyle CssText="BORDER-RIGHT: #335ea8 1px solid; PADDING-RIGHT: 3px; BORDER-TOP: #335ea8 1px solid; PADDING-LEFT: 3px; FONT-SIZE: 12px; PADDING-BOTTOM: 2px; BORDER-LEFT: #335ea8 1px solid; CURSOR: hand; PADDING-TOP: 2px; BORDER-BOTTOM: #335ea8 1px solid; FONT-FAMILY: Tahoma; BACKGROUND-COLOR: #ffe1ac"></HoverStyle>
<NormalStyle CssText="PADDING-RIGHT: 4px; PADDING-LEFT: 4px; FONT-SIZE: 12px; PADDING-BOTTOM: 3px; CURSOR: hand; BORDER-TOP-STYLE: none; PADDING-TOP: 3px; FONT-FAMILY: Tahoma; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none"></NormalStyle>
<ItemTemplates>
<eo:ToolBarItem Type="Custom">
<NormalStyle CssText="background-color:transparent;border-bottom-style:none;border-left-style:none;border-right-style:none;border-top-style:none;padding-bottom:1px;padding-left:2px;padding-right:2px;padding-top:2px;" />
<HoverStyle CssText="background-color:transparent;border-bottom-style:none;border-left-style:none;border-right-style:none;border-top-style:none;padding-bottom:1px;padding-left:2px;padding-right:2px;padding-top:2px;" />
<DownStyle CssText="background-color:transparent;border-bottom-style:none;border-left-style:none;border-right-style:none;border-top-style:none;padding-bottom:1px;padding-left:2px;padding-right:2px;padding-top:2px;" />
</eo:ToolBarItem>
<eo:ToolBarItem Type="DropDownMenu">
<NormalStyle CssText="background-image:url('00100205');background-position-x:right;border-bottom-style:none;border-left-style:none;border-right-style:none;border-top-style:none;cursor:hand;padding-bottom:3px;padding-left:4px;padding-right:4px;padding-top:3px;" />
<HoverStyle CssText="background-color:#ffe1ac;background-image:url('00100206');background-position-x:right;border-bottom-color:#335ea8;border-bottom-style:solid;border-bottom-width:1px;border-left-color:#335ea8;border-left-style:solid;border-left-width:1px;border-right-color:#335ea8;border-right-style:solid;border-right-width:1px;border-top-color:#335ea8;border-top-style:solid;border-top-width:1px;cursor:hand;padding-bottom:2px;padding-left:3px;padding-right:3px;padding-top:2px;" />
<DownStyle CssText="BORDER-RIGHT: #335ea8 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #335ea8 1px solid; PADDING-LEFT: 4px; BACKGROUND-POSITION-X: right; BACKGROUND-IMAGE: url(00100206); PADDING-BOTTOM: 1px; BORDER-LEFT: #335ea8 1px solid; CURSOR: hand; PADDING-TOP: 3px; BORDER-BOTTOM: #335ea8 1px solid; BACKGROUND-COLOR: #ffe1ac" />
</eo:ToolBarItem>
</ItemTemplates>
<Items>
<eo:ToolBarItem Type="Custom">
<CustomItem>
<div style="white-space: nowrap;">
<asp:Literal ID="lblStartDate" runat="server" Text="*Start:"
/><asp:TextBox ID="txtStartDate" runat="server" Enabled="false"
style="vertical-align:middle; font-size: 8pt;" Columns="12"
/><asp:Image runat="server" ImageUrl="images/calendar_big.gif"
width="20" Height="20"
style="vertical-align:middle" ID="imgStartSel" />
</div>
</CustomItem>
</eo:ToolBarItem>
<eo:ToolBarItem Type="Custom">
<CustomItem>
<div style="white-space: nowrap;">
<asp:Literal ID="lblEndDate" runat="server" Text="*End:"
/><asp:TextBox ID="txtEndDate" runat="server" Enabled="false"
style="vertical-align:middle; font-size: 8pt;" Columns="12"
/><asp:Image runat="server" ImageUrl="images/calendar_big.gif"
width="20" Height="20"
style="vertical-align:middle" ID="imgEndSel" />
</div>
</CustomItem>
</eo:ToolBarItem>
<eo:ToolBarItem Type="Custom">
<CustomItem>
<div style="white-space: nowrap;">
<asp:Literal ID="lblTimespan" runat="server" Text="*Other:"
/><asp:DropDownList ID="Timespan" runat="server" style="vertical-align:middle; font-size: 8pt;"
AutoPostBack="true">
<asp:ListItem Text="Custom" Value="customRange" />
<asp:ListItem Text="Current Day" Value="currentDay" Selected="true" />
<asp:ListItem Text="Last Day" Value="pastDay" />
<asp:ListItem Text="Last Week" Value="pastWeek" />
<asp:ListItem Text="Last Month" Value="pastMonth" />
<asp:ListItem Text="Past 3 Months" Value="past3Month" />
<asp:ListItem Text="Past 6 Months" Value="past6Month" />
<asp:ListItem Text="Past Year" Value="pastYear" />
</asp:DropDownList><asp:HiddenField ID="HiddenField2" runat="server" />
</div>
</CustomItem>
</eo:ToolBarItem>
<eo:ToolBarItem CommandName="Graph" ImageUrl="00101069" Text="Graph" ToolTip="Update Graphs">
</eo:ToolBarItem>
</Items>
</eo:ToolBar>
</div>
</form>
</body>
</html>