I am using the exact example as shown here -http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/hierarchical-grid-types-and-load-modes/several-tables-at-a-level 

I am using SeverOnDemand on Master and DetailTables. 

Using below line in RadGrid1_DetailTableDataBind(), all the rows in the masterTable gets expanded on click of the Expand toggle button.

 RadGrid1.MasterTableView.HierarchyDefaultExpanded = True
e.DetailTableView.HierarchyDefaultExpanded = True

How to make the row expand or collapse on toggle sever side?

Any help is appreciated. Thanks.

Hi Maria,

Thanks for the reply. I am able to expand - click on a single expand button expands all the rows, as I have the RadGrid1.MasterTableView.HierarchyDefaultExpanded = True
            e.DetailTableView.HierarchyDefaultExpanded = True

in RadGrid1_DetailTableDataBind()

I want to expand a single selected row and collapse the same on clicking the toggle button.

Also, where should I call these funs - CollapseAllClick and ExpandAllClick

Thanks.

I also tried this demo on Grid - Hierarchy with Templates - http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/hierarchy-with-templates/defaultvb.aspx?show-source=true

I am facing the same problem again, I couldn't toggle expand or collapse (server side).

All i get is the expanded first row on load, as in RadGrid1_PreRender() 

If Not Page.IsPostBack Then
                RadGrid1.MasterTableView.Items(0).Expanded = True
                RadGrid1.MasterTableView.Items(0).ChildItem.FindControl("InnerContainer").Visible = True
End If

Okay, I found where I get hit.

This one is  Grid - Hierarchy with tempaltes.

I am using filterCombos in the radgrid. Without filters, eveything works fine. But whenever I filter either the inbuilt filer or the filter combos, radgrid.rebind is called and then the toggle stops working. Any ideas ????

 Protected Sub RadGrid1_PreRender(sender As Object, e As EventArgs) Handles RadGrid1.PreRender
        Dim filterExp As String = RadGrid1.MasterTableView.FilterExpression.ToString()
        If filterExp <> "" Then
            filterExp = Replace(filterExp.ToUpper, "[", "")
            filterExp = Replace(filterExp, "]", "")
            RadGrid1.MasterTableView.DataSource = Nothing
            RadGrid1.MasterTableView.Rebind()
        End If      
    End Sub

 Protected Sub RadGrid1_ItemCommand(sender As Object, e As GridCommandEventArgs) Handles RadGrid1.ItemCommand
        If TypeOf e.Item Is GridCommandItem Then
            If e.CommandName = "InitShowAll" Then
                RadGrid1.MasterTableView.FilterExpression = String.Empty
                For Each column As GridColumn In RadGrid1.MasterTableView.RenderColumns
                    If TypeOf column Is GridBoundColumn Then
                        Dim boundColumn As GridBoundColumn = TryCast(column, GridBoundColumn)
                        boundColumn.CurrentFilterValue = String.Empty
                    End If
                Next
                RadGrid1.MasterTableView.Rebind()
            End If
        End If
        If e.CommandName = RadGrid.ExpandCollapseCommandName AndAlso TypeOf e.Item Is GridDataItem Then
            DirectCast(e.Item, GridDataItem).ChildItem.FindControl("InnerContainer").Visible = Not e.Item.Expanded
        End If
    End Sub
    Protected Sub RadGrid1_ItemCreated(sender As Object, e As GridItemEventArgs) Handles RadGrid1.ItemCreated
        If TypeOf e.Item Is GridNestedViewItem Then
            e.Item.FindControl("InnerContainer").Visible = DirectCast(e.Item, GridNestedViewItem).ParentItem.Expanded
        End If
    End Sub

Thanks

Hi Maria, 

I already have RetainExpandStateOnRebind="true"  in the parent RadGrid and also in the Radpageview radGrids. But it is not working. I have attached the before and after filtering screen shots. You can see the toggle icon is shown as expanded but there is no grid visible. I even tried closing the row and expanding it again. Still nothing.

<MasterTableView CommandItemDisplay="Top" DataKeyNames="TASK_ID" CssClass="table" ClientDataKeyNames="TASK_ID, STATUS" TableLayout="Auto" HorizontalAlign="NotSet" AutoGenerateColumns="false" RetainExpandStateOnRebind="true" HierarchyLoadMode="ServerOnDemand" AllowFilteringByColumn="true" AllowMultiColumnSorting="True">

In Grid PreRender, I am calling the Rebind().

 Protected Sub RadGrid1_PreRender(sender As Object, e As EventArgs) Handles RadGrid1.PreRender
        Dim filterExp As String = RadGrid1.MasterTableView.FilterExpression.ToString()
        If filterExp <> "" Then
            filterExp = Replace(filterExp.ToUpper, "[", "")
            filterExp = Replace(filterExp, "]", "")
            RadGrid1.MasterTableView.DataSource = Nothing
            RadGrid1.MasterTableView.Rebind()
        End If
End Sub

Thanks.

I have RadGrid1_NeedDataSource() for the main grid, and declarative binding for the nested radgrids. Where should rebind? 

Protected Sub RadGrid1_ItemCreated(sender As Object, e As GridItemEventArgs) Handles RadGrid1.ItemCreated

        'BELOW LINES: if comment these lines - filter works for outer grid and not for inner grid; if uncommented - filter works for inner and not for outer grid. What piece of code am I missing ?
        If TypeOf e.Item Is GridNestedViewItem Then
            e.Item.FindControl("InnerContainer").Visible = DirectCast(e.Item, GridNestedViewItem).ParentItem.Expanded
        End If
    End Sub

Thanks.

Looks like same issue that was discussed here but i couldn't find a solution yet  -http://www.telerik.com/forums/nestedviewtemplate-and-filtering

Update:

The parent filter works.  I removed the Parent RadGrid1_ItemCreated() and  I updated the Parent Prerender, but I couldn't perform expand/filter/sort in the inner grid after filtering the Parent grid.

Protected Sub RadGrid1_PreRender(sender As Object, e As EventArgs) Handles RadGrid1.PreRender
        Dim filterExp As String = RadGrid1.MasterTableView.FilterExpression.ToString()
        If filterExp <> "" Then
            filterExp = Replace(filterExp.ToUpper, "[", "")
            filterExp = Replace(filterExp, "]", "")
            RadGrid1.MasterTableView.DataSource = Nothing

            LoopHierarchyRecursive((RadGrid1.MasterTableView))         
        End If    
    End Sub

 Protected Sub LoopHierarchyRecursive(ByVal gridTableView As GridTableView)
        gridTableView.Rebind()

        For Each nestedViewItem As GridNestedViewItem In gridTableView.GetItems(GridItemType.NestedView)
            nestedViewItem.FindControl("InnerContainer").Visible = DirectCast(nestedViewItem, GridNestedViewItem).ParentItem.Expanded 
            If nestedViewItem.NestedTableViews.Length > 0 Then
                LoopHierarchyRecursive(nestedViewItem.NestedTableViews(0))
            End If
        Next
    End Sub

This is so frustrating.

It would be really helpful if i can get a sample code for Grid - Hierarchy with Templates , with filters in both outer and inner grids.

That worked(for now). Thanks Maria.