class_docstr: abstract base class for tooltips, with delayed on-hover display
docstr: event handler to display the tooltip
docstr_tok: ["event","handler","to","display","the","tooltip"]
code: def _show_event(self, event=None):
      """event handler to display the tooltip"""
      if self.hover_delay:
          self.schedule()
      else:
          self.showtip()
  
imports: from tkinter import *
label_desc: Use image node_id 3 for calling the OnHoverTooltipBase obj's underlying member method code with example usage: obj._show_event(event) without return types