Hi Marcel,
Thank you for your interest in Syncfusion Products.
You can add a new row to GridGroupingControl by enabling AllowNew property and invoking AddNew method which lets you to enter into edit mode to insert a new record. Please refer the code snippet below to achieve this through button click event.
protected void Button1_Click(object sender, EventArgs e)
{
//Enable the AllowNew property.
this.GridGroupingControl1.TableDescriptor.AllowNew = true;
//Invoke the AddNew() to enter into edit mode.
this.GridGroupingControl1.Table.AddNew();
}
Please refer a simple sample to illustrate this.
http://files.syncfusion.com/support/GGC.Web/7.2.0.20/F81117/main.htmPlease let me know if this helps you.
Thanks,
Rekha