4 files changed, 11 insertions, 15 deletions
diff --git a/button.go b/button.go
index c3f5c7e..2c6706f 100644
--- a/button.go
+++ b/button.go
@@ -19,11 +19,7 @@ type Button struct {
 // NewButton creates a new button with the specified text.
 func NewButton(text string) (b *Button) {
 	return &Button{
-		sysData:	&sysData{
-			cSysData:		cSysData{
-				ctype:	c_button,
-			},
-		},
+		sysData:	mksysdata(c_button),
 		initText:	text,
 		Clicked:	make(chan struct{}),
 	}
diff --git a/checkbox.go b/checkbox.go
index 89768ef..fc5c197 100644
--- a/checkbox.go
+++ b/checkbox.go
@@ -20,11 +20,7 @@ type Checkbox struct {
 // NewCheckbox creates a new checkbox with the specified text.
 func NewCheckbox(text string) (c *Checkbox) {
 	return &Checkbox{
-		sysData:	&sysData{
-			cSysData:		cSysData{
-				ctype:	c_checkbox,
-			},
-		},
+		sysData:	mksysdata(c_checkbox),
 		initText:	text,
 	}
 }
diff --git a/sysdata.go b/sysdata.go
index 3ffc4c0..eda749e 100644
--- a/sysdata.go
+++ b/sysdata.go
@@ -36,3 +36,11 @@ const (
 	c_checkbox
 	nctypes
 )
+
+func mksysdata(ctype int) *sysData {
+	return &sysData{
+		cSysData:		cSysData{
+			ctype:	ctype,
+		},
+	}
+}
diff --git a/window.go b/window.go
index da5606a..5bf167a 100644
--- a/window.go
+++ b/window.go
@@ -25,11 +25,7 @@ type Window struct {
 // NewWindow creates a new window with the given title and size. The window is not constructed at the OS level until a call to Open().
 func NewWindow(title string, width int, height int) *Window {
 	return &Window{
-		sysData:		&sysData{
-			cSysData:		cSysData{
-				ctype:	c_window,
-			},
-		},
+		sysData:		mksysdata(c_window),
 		initTitle:		title,
 		initWidth:		width,
 		initHeight:	height,