I was having trouble getting my databound grid to accept the creation of a row with the enter key as it would the tab key. Here is what I came up with to fix the problem.
Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As Boolean
If keyData = Keys.Enter And Me.DataGridView1.IsCurrentCellInEditMode Then
Return MyBase.ProcessCmdKey(msg, keyData)