code: func (win *Window) TooltipOpen(width int, scale bool, updateFn UpdateFn) {
  	in := &win.ctx.Input
  
  	if scale {
  		width = win.ctx.scale(width)
  	}
  
  	var bounds rect.Rect
  	bounds.W = width
  	bounds.H = nk_null_rect.H
  	bounds.X = (in.Mouse.Pos.X + 1)
  	bounds.Y = (in.Mouse.Pos.Y + 1)
  
  	win.ctx.popupOpen(tooltipWindowTitle, WindowDynamic|WindowNoScrollbar|windowTooltip, bounds, false, updateFn)
  }
docs: // Displays a tooltip window.