It looks like there is a problem with skinning native .net dropdownlist in Firefox 4 beta 7. I realize this is beta, but wanted to bring it to your attention before it went to production. Sample project available, aspx page copied below.. Works fine in IE8 and older versions of Firefox. Skinnedddl.jpg is screenshot from Firefox.
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<%@ Register Assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<%--<%@ Register src="UserControls/navtabs.ascx" tagname="NavTabs" tagprefix="nt" %>
<%@ Register src="UserControls/navheader.ascx" tagname="NavHead" tagprefix="nh" %>--%>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<%@ Register Assembly="System.Web.Ajax" Namespace="System.Web.UI" TagPrefix="asp" %>
<
html
xmlns
=
"http://www.w3.org/1999/xhtml"
>
<
head
runat
=
"server"
>
<
title
></
title
>
</
head
>
<
body
>
<
form
id
=
"form1"
runat
=
"server"
>
<
div
>
</
div
>
<
asp:ToolkitScriptManager
ID
=
"ToolkitScriptManager1"
runat
=
"server"
EnablePartialRendering
=
"true"
CombineScripts
=
"false"
> </
asp:ToolkitScriptManager
>
<
telerik:RadFormDecorator
runat
=
"server"
ID
=
"RadFormDecorator1"
EnableEmbeddedSkins
=
"true"
DecoratedControls
=
"All"
/>
<
asp:DropDownList
runat
=
"server"
ID
=
"ddlArea"
AutoPostBack
=
"false"
Width
=
"200"
>
<
asp:ListItem
Value
=
"-1"
Text
=
"Select County"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"26"
Text
=
"Baker"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"1"
Text
=
"Benton"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"2"
Text
=
"Clackamas"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"3"
Text
=
"Clark"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"4"
Text
=
"Clatsop"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"5"
Text
=
"Columbia"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"6"
Text
=
"Coos"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"7"
Text
=
"Cowlitz"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"27"
Text
=
"Crook"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"28"
Text
=
"Curry"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"8"
Text
=
"Deschutes"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"9"
Text
=
"Douglas"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"29"
Text
=
"Gilliam"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"30"
Text
=
"Grant"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"31"
Text
=
"Harney"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"10"
Text
=
"Hood River"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"11"
Text
=
"Jackson"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"12"
Text
=
"Jefferson"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"13"
Text
=
"Josephine"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"14"
Text
=
"Klamath"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"32"
Text
=
"Lake"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"15"
Text
=
"Lane"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"16"
Text
=
"Lane (coastal)"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"17"
Text
=
"Lincoln"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"18"
Text
=
"Linn"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"33"
Text
=
"Malheur"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"19"
Text
=
"Marion"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"34"
Text
=
"Morrow"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"20"
Text
=
"Multnomah"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"21"
Text
=
"Polk"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"35"
Text
=
"Sherman"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"22"
Text
=
"Tillamook"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"23"
Text
=
"Umatilla"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"36"
Text
=
"Union"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"37"
Text
=
"Wallowa"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"38"
Text
=
"Wasco"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"24"
Text
=
"Washington"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"39"
Text
=
"Wheeler"
></
asp:ListItem
>
<
asp:ListItem
Value
=
"25"
Text
=
"Yamhill"
></
asp:ListItem
>
</
asp:DropDownList
>
<
asp:CustomValidator
runat
=
"server"
Font-Size
=
"8"
id
=
"CustomValidator6"
ControlToValidate
=
"ddlArea"
ErrorMessage="<br> * Area is required." Display="Dynamic" />
<
telerik:RadToolTip
ID
=
"txtCountyTT"
runat
=
"server"
Width
=
"150"
AutoCloseDelay
=
"10000"
TargetControlID
=
"ddlArea"
Position
=
"MiddleRight"
OffsetY
=
"0"
OffsetX
=
"10"
ShowDelay
=
"300"
Text
=
"Required: County where most employees represented by this survey work."
>
</
telerik:RadToolTip
>
</
form
>
</
body
>
</
html
>