Hello Sayuri,

It works fine when I add the column. Besides, the sample does not show ColumnSet sample.

Regards,
Handy

Hello,

As I said before, it is not a bug. It is a different behaviour rendering in HTML and XHTML.
You would need to adjust the style.

Here, I show you the prove about white space below WebGrid control.
I made 3 divs in simple sample (default.aspx) to show you that I can replicate the same problem without WebGrid.
If you put <p> in the bottom <div>, you will able to see the white space. If you open in HTML doctype, it works well. That's because HTML and XHTML has some differnces behaviour in rendering its element and style.

Or, try to remove <p> in BrokenPage.aspx. You will see that the white area at the bottom grid would be dissapeared.
To remove the white space, simply set padding and margin to 0 in your <p>.

However, about the resize issue when resize the page, it might be an issue.
When you resize the page, WebGrid should automatically resize based on the screen.
However, sometimes, the resize got stuck by time out and not functioning properly.
In this case, we would like to call wgDoResize(true,true) with timeout in window::onresize.
WebGrid would resize when called this code.
Based on your scenario, I am able to resize WebGrid when resize the screen. But I found one issue. The height is not resized. 
I would need more time to discuss this issue to our developer teams.

Regards,
Handy

Hi Eric,

There is no much detail information about PreRender event. I will try to ask our developer regarding this information. For information, you can see our WebGrid server side sequence life cycle in our documentation (Features and Concepts>>Events>>Event sequence of server side event).

Regards,
Handy

Hi Eric,

Here is the reason why it is not said as bug.

When postback, it’s too early because the columns are then overridden with the setting which is sent from the client-side. That’s why Column D is gone.

To address this issue, there is others workaround.

 Private Sub InitializeColumns()
        Const cDataWidth As Integer = 80
        AddHiddenGridColumn(grdUpper, "Upper_Id", "Upper_Id")
        AddHiddenGridColumn(grdUpper, "Upper_Parent_Id", "Upper_Parent_Id")
        AddGridColumn(grdUpper, "Description", "Description", "Description", cWidthUpperDescription)
        AddGridColumn(grdUpper, "A", "A", "A", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "B", "B", "B", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "C", "C", "C", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        AddGridColumn(grdUpper, "D", "D", "D", Nothing, Sorting.Yes, Nothing, cColorLeft, HorizontalAlign.Left, cDataWidth)
        grdUpper.RootTable.DataKeyField = "Upper_Id"
        grdUpper.RootTable.SelfReferencingSettings.ChildDataMember = "Upper_Parent_Id"
        grdUpper.RootTable.SelfReferencingSettings.Enabled = True
        grdUpper.RootTable.SelfReferencingSettings.ParentDataMember = "Upper_Id"
        grdUpper.RootTable.SelfReferencingSettings.ExpandColumnMember = "Description"
        grdUpper.RootTable.SelfReferencingSettings.LoadOnDemand = False
        grdUpper.RootTable.SelfReferencingSettings.ApplyChildSorting = True
    End Sub
 Protected Sub grdUpper_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles grdUpper.Init
        If (Not IsPostBack) Then
            InitializeColumns()
        End If
    End Sub
 Protected Sub grdUpper_Load(sender As Object, e As System.EventArgs) Handles grdUpper.Load
        If IsPostBack Then
            grdUpper.RootTable.Columns.Clear()
            InitializeColumns()
        End If
    End Sub

Regards,
Handy

Hi Eric,

I have forwarded your feedback to our developer. I will update to you when there is a progress regarding this issue or not.

Regards,
Handy