The image is a little Add png icon (from examples) and it blows it up. I can't find anywhere to make it the normal size (or force a size). ItemStyle-width or height, HeaderStyle-width or height, or what's below don't have any affect on it. See screenshot.
<MasterTableView DataMember="Devices" DataKeyNames="ArticleID" headerStyle-Font-Bold="true" AllowFilteringByColumn="true" PageSize="20" >
<Columns>
<telerik:GridButtonColumn
CommandName="InitInsert"
Text="Add a Claim for this Device"
UniqueName="AddNewClaim"
ButtonType="imageButton"
ImageUrl="../../resources/Images/AddRecord.png"> <HeaderStyle Width="1px" /><ItemStyle Width="1px" /> </telerik:GridButtonColumn>
<telerik:GridBoundColumn
SortExpression="SerialNumber"
HeaderText="Serial Number"
HeaderButtonType="TextButton"
DataField="SerialNumber"
UniqueName="SerialNumber"
HeaderStyle-Width="400"
FilterControlWidth="100"
CurrentFilterFunction="EqualTo"
AutoPostBackOnFilter="True"
AllowFiltering="True" />
<telerik:GridBoundColumn SortExpression="ArticleID" HeaderText="Article ID" HeaderButtonType="TextButton"
DataField="ArticleID" UniqueName="ArticleID" HeaderStyle-Width="800" FilterControlWidth="800" Visible="false" />
</Columns>