Ask : Cannot add, remove or update listgrid

Hi guys,

I’m newbie in this smartGWT. Currently I’m developing an application with SmartGWT.

Here is the case,

I have one listgrid, one dynamic form and one button (Save Button). What I want to achieve is adding & updating new record by clicking the button. And then I want to add the record from dynamic form into ListGrid just like the sample here:
http://www.smartclient.com/smartgwt/showcase/#add_grid_form_category

I follow the same way but It won’t be added into ListGrid.

THen I try another case which Remove the selected data in ListGrid:
the code for removing the selected data:
anyGrid.RemoveSelectedData();

I just don’t understand why it won’t affect the listGrid.

Thanks,
Dastarn