Interresting! When the InputSize is more than 20 it overlaps the browse button. There is something wrong with the template. How to customize or modify the RadUpload template? This is what I'm looking for and the only workaround I can see.
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Definitly, I can't find a workable solution. I reduced de InputSize from 55 to 20 to temporarily fix the problem. The control with is wide enough but the the input size is too small. I hope that this problem will be fixed in the next release.
<telerik:RadStyleSheetManager id="RadStyleSheetManager1" runat="server" CdnSettings-TelerikCdn="Disabled"/>
<telerik:RadScriptManager ID="RadScriptManager1" runat="server" EnableCdn="false" CdnSettings-TelerikCdn="Disabled">
<Scripts>
<%--Needed for JavaScript IntelliSense in VS2010--%>
<%--For VS2008 replace RadScriptManager with ScriptManager--%>
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />
</Scripts>
</telerik:RadScriptManager>
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
</telerik:RadAjaxManager>
<telerik:RadUpload ID="RadUpload1" runat="server" InputSize="20" InitialFileInputsCount="1"
Width="450px" Skin="Web20" OnValidatingFile="RadUpload1_ValidatingFile"
ControlObjectsVisibility="RemoveButtons, AddButton">
<Localization Select="<%$ Resources:RadUpload, Select %>"
Remove="<%$ Resources:RadUpload, Remove %>"
Add="<%$ Resources:RadUpload, Add %>"
Clear="<%$ Resources:RadUpload, Clear %>"
Delete="<%$ Resources:RadUpload, Delete %>" />
</telerik:RadUpload>