How can I make the Enter Key behave like the Tab Key and move to the next cell

You can override ProcessCmdKey, catch the Enter Key, and swap it for a Tab key by sending a Tab, and not processing the Enter Key.

[C#]
	public class MyDataGrid : DataGrid
	{
		protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)
		{
			if(msg.WParam.ToInt32() == (int) Keys.Enter)
			{
				SendKeys.Send('{Tab}');
				return true;
			}
			return base.ProcessCmdKey(ref msg, keyData);
		}
	}


[VB.NET]
	Public Class MyDataGrid
		Inherits DataGrid
     
		Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, keyData As System.Windows.Forms.Keys) As Boolean
			If msg.WParam.ToInt32() = CInt(Keys.Enter) Then
				SendKeys.Send('{Tab}')
				Return True
			End If
			Return MyBase.ProcessCmdKey(msg, keyData)
		End Function ’ProcessCmdKey

	End Class ’MyDataGrid