[1.3] Is bug for fileupload in PropertyGrid?

[tms2003@126.com]

Hi,Dear Sir:

I place a fileupload control in propertygrid, my code like this:

<ext:PropertyGrid ID="gridProperties" runat="server" Width="260" Icon="Cog" Title="tools"
            Collapsible="true" Split="true" Region="East" Margins="0" Layout="Fit">
          
            <Source>
                
                <ext:PropertyGridParameter Name="bg" Value="">
                    <Editor>
                      <ext:FileUploadField ID="felSDishNameImg" runat="server" EmptyText="please selected a photo" 
                            ButtonText="" Icon="ImageAdd" AnchorHorizontal="95%" >
                        
                      </ext:FileUploadField>
                    </Editor>
                </ext:PropertyGridParameter>
            </Source>
            <View>
                <ext:GridView ID="GridView1" ForceFit="true" ScrollOffset="2" runat="server" />
            </View>
        </ext:PropertyGrid>

but the fileupload button can't trigger,is it a bug for propertygrid?