I have an AsyncUpload control inside a InsertItemTemplate, inside RadGrid and a GridTemplateColumn:
<telerik:GridTemplateColumn HeaderText="Filnavn" SortExpression="FileNameWithExtension"
UniqueName="FileNameWithExtension" EditFormColumnIndex="0">
<ItemTemplate>
---
</ItemTemplate>
<EditItemTemplate>
---
</EditItemTemplate>
<InsertItemTemplate>
<telerik:RadProgressArea runat="server" ID="RadProgressArea1" />
<telerik:RadAsyncUpload runat="server" ID="AsyncUpload1" Width="500px"
AllowedFileExtensions=".dot,.dotx" MultipleFileSelection="Disabled" MaxFileInputsCount="1" >
<FileFilters>
<telerik:FileFilter Description="Word 97-2003-skabelon" Extensions=".dot" />
<telerik:FileFilter Description="Word-skabelon" Extensions=".dotx" />
</FileFilters>
<Localization Cancel="Annuller" Remove="Fjern" Select="Vælg" />
</telerik:RadAsyncUpload>
</InsertItemTemplate>
</telerik:GridTemplateColumn>
But the Width property has no effect. As you can see from the screenshot; the column above has a textbox with the Width property set to 300.