When removing the last ItemCommand from an Item in the Visual Designer, the ItemCommandListener implementation and commandAction() method are removed from the MIDlet declaration, but the 
.setItemCommandListener(this) assignment is NOT removed, resulting in an error...

public TextField getAmountTextField() {
    if (amountTextField == null) {
        // write pre-init user code here
        amountTextField = new TextField("Amount:",
                                  "", 32, TextField.DECIMAL);
        amountTextField.setItemCommandListener(this);  // <<<<-- ERROR!
        amountTextField.setLayout(Item.LAYOUT_LEFT | 
                                  Item.LAYOUT_NEWLINE_BEFORE | 
                                  Item.LAYOUT_EXPAND);
        // write post-init user code here
    }
    return amountTextField;
}