IPickTreeItem fixed width

[Hirn]

Hello dear developers
How do I get a fixed width from IPickTreeItem?
It increases when I select an item.

        DynamicForm selectForm = new DynamicForm();
        selectForm.setWidth("100%");
        selectForm.setNumCols(3);
        selectForm.setColWidths("33%", "34%", "33%");
        selectForm.setHeight(25);

        ProjectsSelectItem selectedProjects = new ProjectsSelectItem(projectsData, project);
        selectedProjects.setWidth(300);
        selectedProjects.setMultiple(false);
        selectedProjects.addChangedHandler(new ChangedHandler() {
            @Override
            public void onChanged(ChangedEvent event) {
                loadProject((String) event.getValue());
            }
        });

        IPickTreeItem selectedCourseItem = new IPickTreeItem();
        selectedCourseItem.setName("selectedCourseItem");
        selectedCourseItem.setCanSelectParentItems(true);
        selectedCourseItem.setWidth(300);
        selectedCourseItem.setShowTitle(false);
        selectedCourseItem.setValueField(CONSTANT._ID);
        selectedCourseItem.setDisplayField(CONSTANT.TITLE);
        selectedCourseItem.setValueTree(projectTree);
        selectedCourseItem.addChangedHandler(new ChangedHandler() {
            public void onChanged(ChangedEvent event) {
            }
          });

        UsersSelectItem selectedUsers = new UsersSelectItem("selectedUsers", usersData, new String[] {user});
        selectedUsers.setWidth(300);
        selectedUsers.addChangedHandler(new ChangedHandler() {
            @Override
            public void onChanged(ChangedEvent event) {
                    loadTasks();
            }
        });

         selectForm.setItems(selectedProjects, selectedCourseItem, selectedUsers);

before selection


after selection

[Isomorphic]

PickTreeItem is a CanvasItem which creates a TreeMenuButton by default. You can configure that AutoChild with overflow:hidden or other size-related settings that you may want.