How to use the event?

[vgrabko]

``
package main

import (
"github.com/visualfc/goqt/ui"
)

func main() {
ui.Run(func() {
w := ui.NewWidget()
defer w.Show()

    r := NewMyWidget()
    r.OnPaintEvent()
})

}

type MyWidget struct {
*ui.QWidget
}

func NewMyWidget() *MyWidget {
w := &MyWidget{}
w.QWidget = ui.NewWidget()
w.InstallEventFilter(w)
return w
}

func (w *MyWidget) OnPaintEvent(e *ui.QPaintEvent) bool {
w.PaintEvent() //w.QWidget.PaintEvent()

painter := ui.NewPainterWithPaintDevice(w)
defer painter.Delete()

//painter.Draw ...

return true

}
``

Errors:
./main.go:15: not enough arguments in call to r.OnPaintEvent ./main.go:31: not enough arguments in call to w.QWidget.PaintEvent

Where to take the variable 'e' ?