Default Group Express doesn't ungroup

[Christopher]

I'm using a RadGrid with a relatively straightforward setup of DataBound columns, and a single Grid Expression that I set on page load like this: 

if (!Page.IsPostBack)
{
    //set up an initial group by base
    var baseExpression = new GridGroupByExpression();
    var selectField = new GridGroupByField {FieldAlias = "Base", FieldName = "Dest_Name", HeaderValueSeparator = " "};
    baseExpression.SelectFields.Add(selectField);

    var groupField = new GridGroupByField() {FieldName = "Dest_Name"};
    baseExpression.GroupByFields.Add(groupField);

    Grid.MasterTableView.GroupByExpressions.Add(baseExpression);
}

I then load the data via DataSource = foo and DataBind();

The problem comes when I right click on the column header and select ungroup form the menu, it doesn't get ungrouped.  I can group and ungroup with other columns, but the initial column does not ungroup, unless I use the menu to group by the column, and then ungroup it.

Is there a way around this behaviour?

[Pavlina]

Hello Christopher,

Note that grouping is not supported with simple data-binding (calling DataBind()) as explained in the description section of the following online example:
http://demos.telerik.com/aspnet-ajax/grid/examples/groupby/outlookstyle/defaultcs.aspx

Greetings,
Pavlina
the Telerik team

[Christopher]

So does that mean that I can only use declarative databinding if i want to have grouping?

[Pavlina]

Hi Christopher,

When you want the grid to perform grouping functionality you can also use Advanced DataBinding(using NeedDataSource event) rather than Simple DataBinding. Try to populate grid using Advanced DataBinding and see whether this avoids the issue. 

The following online example shows how to populate grid using Advanced DataBinding:
Grid / Advanced Data Binding 

All the best,

Pavlina
the Telerik team

[Christopher]

I get the same behavior when using the NeedDataSource event.

I wire up the event during Page_Init:

Grid.NeedDataSource += GetGridData;

With the code for the event looking like this:

private void GetGridData(object sender, GridNeedDataSourceEventArgs e)
{
        ((RadGrid) sender).DataSource =               AnalysisManager.GetAircraftSupportability(CurrentlySelectedPlan);
}

[Pavlina]

Hi Christopher,

Can you please verify that EnableViewState property of the RadGrid is set to true? Keep in mind that RadGrid does not manage grouping states when its ViewState is disabled. Please refer to the following help article for more information:

Optimizing ViewState usage

If you need to use grouping in RadGrid, its ViewState should be enabled.

Kind regards,
Pavlina
the Telerik team