def insertIndent():
            if self.useTabs:
                cursor.insertText('\t')
            else:  # indent to integer count of indents from line start
                charsToInsert = self.width - (len(self._qpart.textBeforeCursor()) % self.width)
                cursor.insertText(' ' * charsToInsert)
def main(self):
      UI.OpenDialog(
        VBox(
          Heading("This Is a Heading."),
          Label("This is a Label."),
          PushButton("&OK")
        )
      )
      UI.UserInput()
      UI.CloseDialog()