BoldSignEasily embed eSignatures in your .NET applications. Free sandbox with native SDK available.
this.gridGroupingControl1.TableControl.Focus();
this.gridGroupingControl1.TableControl.CurrentCell.BeginEdit();
TextBox tb = this.gridGroupingControl1.TableControl.CurrentCell.Renderer.Control as TextBox;
if(tb != null)
tb.SelectAll();
The last 2 lines select all the text. If you just want the cursor at the beginning of the text, you can omit those lines.