Greetings, David -

I believe that no action occurs by default if the Enter key is pressed when input focus is in a DW column that uses the DDDW edit style. Technically, the DW's edit control has focus, and the edit control makes no assumption that pressing the Enter key causes an AcceptText to occur. Some limited "navigation" keystrokes for the drop-down list (Up/Down arrow keys as you noted, for example) are processed. PageUp/PageDown are not.

If you want an action in a DW to occur when the user presses Enter, you have to create a user event mapped to pbm_dwnkey and place the code to check which key has been pressed in that event script. Keep in mind that if there is a command button with it's Default property enabled in the same window as the DW, the command button's Clicked event will fire when the Enter key is pressed.

Regards, John