Select entire row of a data grid view #11

Uisng Treewalker ,i am able to get required row number from the grid but not able to select that row.

i have tried selection,invoke, and other pattern but everything is throwing error like un supported pattern.
myrow=2 //example
// to get row element)
AutomationElement rowElementToSelect = requiredGrid.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.AutomationIdProperty, myrow.ToString()));

// get row header
AutomationElement rowHeader = rowElementToSelect.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Header));

// invoke it (select the whole line)
//((InvokePattern)rowHeader.GetCurrentPattern(InvokePattern.Pattern)).Invoke();

Environment: Windows forms,Infragistics,.netframework 4,

Can any one help to get the solution for this scenario?