There was a bug with the negative sign in number controls when all or part of a number was selected. The selected portion of the number was not being deleted.

This is the expected behavior when the negative sign key is used.

If a negative sign is part of the selected text, the selected text will be deleted and the negative sign preserved.

If the selected text contains a decimal point and removing the text would violate the data format of the number, the negative sign key will be ignored.

If a negative sign is not part of the selected text, the negative sign key will invert the polarity of the number. Provided the decimal point rul is not violated, the selected text will be deleted.