How do I open the input prompt for InputField / VRCUrlInputField from Udon?

Hello. I want to display multiple InputFields consecutively (I want the second InputField to open automatically when the first InputField is closed),
but when I use ActivateInputField(), only the focus is changed, and the input prompt is not displayed.
I tried various functions such as Select(), but I couldn’t find a way to open the UI.
Can anyone tell me a solution?