code: func SendEventToChild(parent Control, ev Event) bool {
  	var child Control
  	if IsMouseClickEvent(ev) {
  		child = ChildAt(parent, ev.X, ev.Y)
  		if child != nil && !child.Active() {
  			ActivateControl(parent, child)
  		}
  	} else {
  		child = ActiveControl(parent)
  	}
  
  	if child != nil && child != parent {
  		ev.Target = child
  		res := child.ProcessEvent(ev)
  
  		if cparent := ClippedParent(child); cparent != nil && cparent != child {
  			cparent.ProcessEvent(ev)
  		}
  
  		return res
  	}
  
  	return false
  }
docs: // SendEventToChild tries to find a child control that should recieve the evetn
  // For mouse click events it looks for a control at coordinates of event,
  // makes it active, and then sends the event to it.
  // If it is not mouse click event then it looks for the first active child and
  // sends the event to it if it is not nil