Textbox exit event prevents to exit userform

Hello, I have a userform with a mandatory textbox. Default value of this textbox is "ID". To force the user to enter an ID number in this textbox I'm using following code:

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This works well but has an unwanted consequence: if the user clicks the form's exit button, he's trapped into the textbox exit event. The only way to get out of this is CTRL+BREAK command.

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Is there a workaround ? Thanks !