Creating a custom Group Template

[Joseph]

Hi guys,

I have a Gridview wich is grouped by a column.

Design

<GroupByExpressions>
                    <telerik:GridGroupByExpression>

                        <SelectFields>
                            <telerik:GridGroupByField   FieldAlias="TL" FieldName="TargetLanguageCode" FormatString="{0:D}"
                                HeaderValueSeparator=": " HeaderText="">

                                </telerik:GridGroupByField>
                                 <telerik:GridGroupByField   FieldAlias="Flag" FieldName="FlagIcon" FormatString="{0:D}"
                                HeaderValueSeparator=": " HeaderText="">

                                </telerik:GridGroupByField>

                        </SelectFields>
                        <GroupByFields>
                            <telerik:GridGroupByField FieldName="TargetLanguageID" SortOrder="Descending"></telerik:GridGroupByField>
                             <telerik:GridGroupByField FieldName="FlagIcon" ></telerik:GridGroupByField>
                        </GroupByFields>
                    </telerik:GridGroupByExpression>
                </GroupByExpressions>

On the Grid ItemDataBound event I delete all the controls from the Group template and add a label and image

protected void gridGeneratePackages_ItemDataBound(object sender, GridItemEventArgs e)
{
    if (e.Item is GridGroupHeaderItem)
    {
        GridGroupHeaderItem item = e.Item as GridGroupHeaderItem;
        Image img = new Image();
        img.ImageUrl = ((DataRowView)e.Item.DataItem)[1].ToString();
        img.Width = 16;
        img.Height = 12;

        Label lbl = new Label();
        lbl.Text = ((DataRowView)e.Item.DataItem)[0].ToString(); ;
        lbl.Style.Add("margin-left", "3px");
        item.DataCell.Controls.Clear();
        item.DataCell.Controls.Add(img);
        item.DataCell.Controls.Add(lbl);
    }
}

This works perfectly when loaded, but when I click on a Grid Arrow to expand a Parent/Child, my added controls are removed and the ones in the design appears.

Any idea if there is a better solution ?

Thanks.

[Mira]

Hello Joseph,

In order to implement the desired functionality, I recommend that you use the ItemCreated event for modifying the controls and the ItemDataBound event for binding them to data.
Please examine the Distinguishing the major differences between ItemCreated and ItemDataBound events help topic for additional information.

I hope this helps.

Regards,
Mira
the Telerik team