func onEntryChanged(assistant *gtk3.Assistant, data ...interface{}) {
pageNumber := assistant.GetCurrentPage()
currentPage := assistant.GetNthPage(pageNumber)
entry := data[0].(*gtk3.Entry)
textLen := entry.GetTextLength()
if textLen > 0 {
assistant.SetPageComplete(currentPage, true)
} else {
assistant.SetPageComplete(currentPage, false)
}
}
