diff --git a/checkbox.go b/checkbox.go
index ab65dbc..e8ffacd 100644
--- a/checkbox.go
+++ b/checkbox.go
@@ -4,9 +4,11 @@ import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/tomo/input"
 import "git.tebibyte.media/tomo/tomo/event"
 
+var _ tomo.Object = new(Checkbox)
+
 // Checkbox is a control that can be toggled.
 type Checkbox struct {
-	tomo.Box
+	box tomo.Box
 	value bool
 	on struct {
 		valueChange event.FuncBroadcaster
@@ -15,18 +17,30 @@ type Checkbox struct {
 
 // NewCheckbox creates a new checkbox with the specified value.
 func NewCheckbox (value bool) *Checkbox {
-	box := &Checkbox {
-		Box: tomo.NewBox(),
+	checkbox := &Checkbox {
+		box: tomo.NewBox(),
 	}
-	box.SetRole(tomo.R("objects", "Checkbox"))
-	box.SetValue(value)
+	checkbox.box.SetRole(tomo.R("objects", "Checkbox"))
+	checkbox.SetValue(value)
 	
-	box.OnButtonDown(box.handleButtonDown)
-	box.OnButtonUp(box.handleButtonUp)
-	box.OnKeyDown(box.handleKeyDown)
-	box.OnKeyUp(box.handleKeyUp)
-	box.SetFocusable(true)
-	return box
+	checkbox.box.OnButtonDown(checkbox.handleButtonDown)
+	checkbox.box.OnButtonUp(checkbox.handleButtonUp)
+	checkbox.box.OnKeyDown(checkbox.handleKeyDown)
+	checkbox.box.OnKeyUp(checkbox.handleKeyUp)
+	checkbox.box.SetFocusable(true)
+	return checkbox
+}
+
+// GetBox returns the underlying box.
+func (this *Checkbox) GetBox () tomo.Box {
+	return this.box
+}
+
+// SetFocused sets whether or not this checkbox has keyboard focus. If set to
+// true, this method will steal focus away from whichever object currently has
+// focus.
+func (this *Checkbox) SetFocused (focused bool) {
+	this.box.SetFocused(focused)
 }
 
 // Value returns the value of the checkbox.
@@ -38,8 +52,8 @@ func (this *Checkbox) Value () bool {
 func (this *Checkbox) SetValue (value bool) {
 	this.value = value
 	// the theme shall decide what checked and unchecked states look like
-	this.SetTag("checked",    value)
-	this.SetTag("unchecked", !value)
+	this.box.SetTag("checked",    value)
+	this.box.SetTag("unchecked", !value)
 }
 
 // Toggle toggles the value of the checkbox between true and false.
@@ -71,7 +85,7 @@ func (this *Checkbox) handleButtonDown (button input.Button) bool {
 
 func (this *Checkbox) handleButtonUp (button input.Button) bool {
 	if !isClickingButton(button) { return false }
-	if this.Window().MousePosition().In(this.Bounds()) {
+	if this.box.Window().MousePosition().In(this.box.Bounds()) {
 		this.Toggle()
 	}
 	return true