@Dale A Not if you have another way to set the focus to the control. True, you can't click in it but if another control gives it the focus, or you TAB into it, keystrokes are seen and handled fine.
@Dave S This statement confuses me.... as to how it would be considered correct?
What does the mousedown (true or false) have to do with normal keyboard operations?
Both of you are correct - Sorry. I must have read much too fast. Returning True in MouseDown does not impair keyword operation in a TextField/TextArea.
However, indeed, returning True in MouseDown will impair all normal mouse operation. Meaning, no more selecting words or paragraphs with the mouse in order to copy or to delete.
@Luigi F :
Here is the solution with a timer:
TimerMouseUp.Mode = Timer.ModeMultiple
In the Action event of the TimerMouseUp Action event:
If not System.MouseDown then
Sender.Mode = Timer.ModeOff
//This is the MouseUp code