Group by column but don't allow user to change it

[strombringer]

I was just about to send a support ticket when I found the solution to a request for the GridView layout that I'd like to share:

The requested layout:
- The grid is grouped by one column by default
- The user can change the sort order of all columns
- The user can't change the grouping of the grid

Solution:
- Add the GroupByExpression for the column in code or through the designer
- RadGridView.EnableGrouping == true (if false, the grouping header is not shown)
- RadGridView.MasterGridViewTemplate.AllowDragToGroup == false (no more columns can be added to the grouping header)
- set the "AllowGroup" property of the column in the grouping header to "false" (the user can't remove the grouping column from the header)

Perhaps someone else finds this useful.

EDIT:
I missed, that the "column button" in the grouping header contains a "X" to remove the group. This Close Button is still enabled and the user can remove the group. Any suggestions?

[Nikolay]

Hi strombringer,

Thank you for sharing your approach with the community. I am updating your Telerik points for it.

In order to remove the close ("X") button, you need to implement the following logic in your project:

GridGroupHeaderItemsContainer container = ((GridTableElement)this.radGridView1.GridElement).HeaderElement.GroupPanel.GroupHeaderList.Items[0] as GridGroupHeaderItemsContainer;
if (container != null)
{
    for (int index = 0; index < container.Children.Count; index++)
    {
        GridGroupHeaderItem item = container.Children[index] as GridGroupHeaderItem;
        item.Children[2].Visibility = ElementVisibility.Collapsed;
    }
}

As you can see, I am taking all the available GridGroupHeaderItems (group buttons) and then I am collapsing the third child of their elements hierarchy (the close button).

I hope this helps. If you have additional questions, feel free to contact me.

Best wishes,
Nikolay
the Telerik team

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[Nadia Sangiovanni]

Hi Support,

I try to implement the proposed solution to remove the "X" on the button of the column in the group header. The "HeaderElement" is not available in the property of a GridTableElement.

Is there any way I can remove the "X" button?

Regards,
Nadia

[Nikolay]

Hello Nadia,

In our latest versions you can remove the "X" buttons from the group items using the code snippet below:

TemplateGroupsElement templateGroups = (TemplateGroupsElement)radGridView1.GridViewElement.GroupPanelElement.PanelContainer.Children[0];
foreach (GroupElement gElement in templateGroups.Children)
{
    foreach (GroupFieldElement gFieldElement in gElement.GroupingFieldElements)
    {
        gFieldElement.RemoveButton.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
    }
}

I hope this will help you.

Regards,
Nikolay
Telerik

[Nadia Sangiovanni]

Tank you Nikolay,

Your solution work perfectly!

Regards,
Nadia