UNSOLVED How to use GeUserArea.DrawCustomButton()

Hi,

I looked at the Python SDK and could not find a detailed explanation, so let me ask two questions about DrawCustomButton().

1. What is the 5th argument "ids" for?

2. Is there a way to receive a message or something when I click on the button?

Here is a simple script that opens a dialog with a UserArea and draws a button.
It looks like just a rectangle is drawn, but I wish I could create an interactive button that can receive triggers with InputEvent() or Message().

Thank you!

import c4d

class MyUserArea(c4d.gui.GeUserArea):
    def DrawMsg(self, x1, y1, x2, y2, msg_ref):
        # Initializes draw region
        self.OffScreenOn()
        self.SetClippingRegion(x1, y1, x2, y2)
        self.DrawRectangle(x1, y1, x2, y2)
        # Draws black background
        self.DrawSetPen(color=c4d.Vector(0))
        self.DrawRectangle(x1, y1, x2, y2)
        # Draws a button
        self.DrawCustomButton(x=20, y=20, w=80, h=40, ids=[0], nofill=False, focus=False)


class MyDialog(c4d.gui.GeDialog):
    ua = MyUserArea()
    def CreateLayout(self):
        area = self.AddUserArea(id=0, flags=c4d.BFH_SCALEFIT|c4d.BFV_SCALEFIT)
        self.AttachUserArea(ua=self.ua, id=area)
        return True

def main():
    dialog = MyDialog()
    dialog.Open(dlgtype=c4d.DLG_TYPE_MODAL, defaulth=200, defaultw=200)

if __name__ == '__main__':
    main()