DateTimePicker.Value = BLANK!! Why won't it let me?

I'm trying to blank out the value of the DateTimePicker... the .Net version will not allow me to do this.

To get around this, I'm attempting to use the checkbox on it, checked I look for a value, unchecked I don't... BUT for some reason, once I choose a Date (at run-time) it will not allow me to Uncheck that box with pre-written code!

The only way to uncheck it is to physically click the check box. Anyone know how I can defeat this evil IDE? :confused: