ctrlutil.go
func FindFirstControl(parent Control, fn func(Control) bool) Control {
	linear := getLinearControlList(parent, fn)
	if len(linear) == 0 {
		return nil
	}

	return linear[0]
}
func FindFirstControl(parent Control, fn func(Control) bool) Control {
	linear := getLinearControlList(parent, fn)
	if len(linear) == 0 {
		return nil
	}

	return linear[0]
}
func FindFirstControl ( parent Control , fn func ( Control ) bool ) Control { linear := getLinearControlList ( parent , fn ) if len ( linear ) == 0 { return nil } return linear [ 0 ] }
// FindFirstControl returns the first child for that fn returns true.
// The function is used to find active or tab-stop control
FindFirstControl returns the first child for that fn returns true . The function is used to find active or tab - stop control