Removed Control.setParent() as the parent/child hierarchy is now unidirectional.

button.go

@@ -12,7 +12,6 @@ type Button struct {
 
 	lock		sync.Mutex
 	created	bool
-	parent	Control
 	sysData	*sysData
 	initText	string
 }
@@ -55,7 +54,3 @@ func (b *Button) setRect(x int, y int, width int, height int) error {
 
 	return b.sysData.setRect(x, y, width, height)
 }
-
-func (b *Button) setParent(c Control) {
-	b.parent = c
-}

control.go

@@ -10,5 +10,4 @@ import (
 type Control interface {
 	apply(window *sysData) error
 	setRect(x int, y int, width int, height int) error
-	setParent(c Control)
 }

window.go

@@ -105,6 +105,3 @@ func (w *Window) apply(window *sysData) error {
 func (w *Window) setRect(x int, y int, width int, height int) error {
 	panic("Window.setRect() should never be called")
 }
-func (w *Window) setParent(c Control) {
-	panic("Window.setParent() should never be called")
-}