Yes, the user can sort on any column. There's a grid prop called 'allowsort'. Again, if you're allowing sorting, you have to make sure you're using the data table's defaultview anytime you're looking at rows.

As for highlighting the entire row, you can set up a handler on the mouseup event. Here's what I have in my grid base class.

this.MouseUp += new System.Windows.Forms.MouseEventHandler(ccGridMouseUp);


private void ccGridMouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
	System.Drawing.Point pt = new Point(e.X,e.Y);
	DataGrid.HitTestInfo hti = this.HitTest(pt);
	if(hti.Type == DataGrid.HitTestType.Cell)
	{
		this.CurrentCell = new DataGridCell(hti.Row, hti.Column);
		this.Select(hti.Row);
	}

}