I fixed the problem of displaing the icon of a file with uppercas exetnsion and store the information about allowed maxmal/total/minimal pixels for images and filesizes for upload in a session now.
I fixed displaing image files that don't fit the defined pixels in the browse window on the internet server.
I fixed the message when triing to upload a file that already exists.
<![CDATA[<asp:textbox id=Image1 runat="server"></asp:textbox>
<ctrl:UploadDialogButton
id=Image1Button
runat="server"
AllowCreateFolder="True"
AllowDelete="True"
DemoMode="True"
FileTypes="gif,jpg"
UploadDirectory="images/"
ControlToFill="Image1"
FileNameOnly="True">
</ctrl:UploadDialogButton>
]]>