我想一個GXT面板添加到我的SmartGWT的標籤面板,但它不是showing.i得到這個error.i已經在其他標籤做到了這一點,它是工作,但在我的第二個標籤。當我選擇第二個選項卡時,我看到空白頁面,並在控制檯中出現此錯誤。我的面板在智能GWT沒有顯示
未捕獲的JavaScript異常[未捕獲的異常:java.lang.AssertionError:具有現有的父窗口小部件可以不被添加到該列表中分離窗口小部件],線路0
這裏是我的代碼
VLayout formBtnFrm = new VLayout();
formBtnFrm.addMember(addEditForm);// addEditForm is DynamicForm
HLayout buttonLayout = new HLayout();
buttonLayout.setMembersMargin(10);
buttonLayout.setHeight(22);
buttonLayout.addMember(createUser);
buttonLayout.addMember(editUser);
buttonLayout.setLayoutAlign(Alignment.CENTER);
formBtnFrm.addMember(buttonLayout);
ContentPanel panel = new ContentPanel();
panel.setFrame(true);
panel.setCollapsible(false);
panel.setAnimCollapse(false);
panel.setButtonAlign(HorizontalAlignment.CENTER);
panel.setHeading("Registration Form");
panel.setLayout(new FitLayout());
panel.add(formBtnFrm);
panel.setSize(350, 250);
groupLayout.addMember(panel);
mainLayout.addMember(groupGrid);
mainLayout.addMember(groupLayout);
addMember(mainLayout);