Row Group expander

[Donnie]

When I load a dataset into the gridview I would like to set the backcolor of the expander box if there is child rows. Is it possible if so then how do I grab box to set the backcolor.

[Jack]

Hi Donnie,

You should handle the ViewCellFormatting event and call the GetChildRows method to distinguish when there are no child rows for a specific row. Here is a sample:

void radGridView1_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
    if (e.CellElement is GridGroupExpanderCellElement)
    {
        GridViewDataRowInfo row = (GridViewDataRowInfo)e.CellElement.RowInfo;
        if (row.ViewTemplate.ChildGridViewTemplates.Count > 0)
        {
            GridViewRowInfo[] rows = row.ViewTemplate.ChildGridViewTemplates[0].GetChildRows(row);
            if (rows != null && rows.Length > 0)
            {
                e.CellElement.DrawFill = true;
                e.CellElement.GradientStyle = GradientStyles.Solid;
                e.CellElement.BackColor = Color.SkyBlue;
                return;
            }
        }
        e.CellElement.DrawFill = false;
    }
}

I hope this helps. If you have further questions, please don't hesitate to ask.

Kind regards,
Jack
the Telerik team

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