非常简单的f#表单锁在键盘输入上

Using the ultra-simple code below, as soon as I press a key on my keyboard while the form is in focus, the form completely locks up. I'm running this inside of F# interactive. The only way to close the form is by clicking "Reset Session" in F# interactive. I've tried adding event handlers to KeyPress, with the same results. I've had no problem adding mouse event handlers, menus, combo boxes etc. Using the ultra-simple code below, as soon as I