Problem with change handler at DynamicForm

[leeboy]

Hello,

I have a problem debugging an application that I hadn´t developed. It uses a DynamicForm, code:

final DynamicForm uploadForm= new DynamicForm();
Datasource csFileImport;
csFileImport = DataSource.get("csFileImport");
uploadForm.setUseAllDataSourceFields(true);
uploadForm.setHeight("25px");
uploadForm.setStyleName("inputFormFile");
uploadForm.setDataSource(csFileImport);
uploadForm.setStyleName("obsUnderlinedCanvas");
uploadForm.setAlign(Alignment.RIGHT);
uploadForm.setNumCols(2);
uploadForm.setColWidths(35, 300);
uploadForm.addItemChangedHandler(new ItemChangedHandler() {
		
			@Override
			public void onItemChanged(ItemChangedEvent event) {
				// TODO Auto-generated method stub
				SC.say("changed");
			}
		});
    	
uploadForm.addItemChangeHandler(new ItemChangeHandler() {
			
			@Override
			public void onItemChange(ItemChangeEvent event) {
				// TODO Auto-generated method stub
				SC.say("change");
			}
		});

The datasource code is:

<DataSource ID="csFileImport">
    <fields>
        <field name="file" type="file" width="450px"/>
    </fields>

    <serverObject className="MyClassName" />
    <operationBindings>
        <binding operationType="update" serverMethod="saveFile" />
        <binding operationType="add" serverMethod="saveFile" />
    </operationBindings>
</DataSource>

I want to capture when someone attach a file to my form, but I can´t, and I don´t know what can I do. Any suggestions???

Thanks!