Hello Xu,

First of all, sorry for the wrong sample that I attached. Yesterday, I have not tried until accepting all changes. So, I also get that issue here. 
I have provided a solution using this snippet code:

function SelectAll(obj)      
      var grid = ISGetObject("WebGrid2");
      for (i = 0; i < grid.TotalLoadedRows; i++) {
          var row = grid.RootTable.GetRow(i);
          var cell = row.GetCells()[3];
          cell.SetValue(true, true);
          cell.ActivateEdit();
          grid.MarkEdit();
          grid.ExitEdit(1, 0, 0);
       }
}

Attached in my simple runable sample. In this sample I also show you how to un-check all checkBox.

Please let me know whether the issue still exist, or if there is another issue.

Thanks.
Riendy

Hi Xu,

In this simple sample, you are using 2 update panel controls to handle WebToolBar and TextBox. Actually, you were right to use UpdatePanel for the TextBox. But, there's a little bit mistake when using updatePanel. WebToolBar already perform FlyPostBack, so that no need to use update panel for WebToolBar. It works as well as expectation on my end. 
Please see the attachment to see the code.

Regards.
Riendy

Hi Michael,

You were unable to see the templates because it was installed in local administrator's document.
If you have to work in domain user, you don't have to reinstall VS and WebUI in the domain user. But, you should copy the template on local administrator's document to the domain user's document.
The templates should be on this path :

C:\Users\[local administrator]\My Documents\Visual Studio 2010\Templates\ProjectTemplates\Visual C#[or Visual Basic]

Then you have to copy the templates from [local administrator] to [Your domain user].

You can also get the templates from here.

Please let me know the result.

Thank you.
Riendy