diff --git a/buttons.go b/buttons.go
new file mode 100644
index 0000000..b6a4f03
--- /dev/null
+++ b/buttons.go
@@ -0,0 +1,106 @@
+// 9 february 2014
+package main
+
+import (
+//	"syscall"
+//	"unsafe"
+)
+
+// Button styles.
+const (
+	// from winuser.h
+	BS_PUSHBUTTON = 0x00000000
+	BS_DEFPUSHBUTTON = 0x00000001
+	BS_CHECKBOX = 0x00000002
+	BS_AUTOCHECKBOX = 0x00000003
+	BS_RADIOBUTTON = 0x00000004
+	BS_3STATE = 0x00000005
+	BS_AUTO3STATE = 0x00000006
+	BS_GROUPBOX = 0x00000007
+	BS_USERBUTTON = 0x00000008
+	BS_AUTORADIOBUTTON = 0x00000009
+	BS_PUSHBOX = 0x0000000A
+	BS_OWNERDRAW = 0x0000000B
+	BS_TYPEMASK = 0x0000000F
+	BS_LEFTTEXT = 0x00000020
+	BS_TEXT = 0x00000000
+	BS_ICON = 0x00000040
+	BS_BITMAP = 0x00000080
+	BS_LEFT = 0x00000100
+	BS_RIGHT = 0x00000200
+	BS_CENTER = 0x00000300
+	BS_TOP = 0x00000400
+	BS_BOTTOM = 0x00000800
+	BS_VCENTER = 0x00000C00
+	BS_PUSHLIKE = 0x00001000
+	BS_MULTILINE = 0x00002000
+	BS_NOTIFY = 0x00004000
+	BS_FLAT = 0x00008000
+	BS_RIGHTBUTTON = BS_LEFTTEXT
+	// from commctrl.h
+//	BS_SPLITBUTTON = 0x0000000C		// Windows Vista and newer and(/or?) comctl6 only
+//	BS_DEFSPLITBUTTON = 0x0000000D	// Windows Vista and newer and(/or?) comctl6 only
+//	BS_COMMANDLINK = 0x0000000E		// Windows Vista and newer and(/or?) comctl6 only
+//	BS_DEFCOMMANDLINK = 0x0000000F	// Windows Vista and newer and(/or?) comctl6 only
+)
+
+// Button WM_COMMAND notifications.
+const (
+	// from winuser.h
+	BN_CLICKED = 0
+	BN_PAINT = 1
+	BN_HILITE = 2
+	BN_UNHILITE = 3
+	BN_DISABLE = 4
+	BN_DOUBLECLICKED = 5
+	BN_PUSHED = BN_HILITE
+	BN_UNPUSHED = BN_UNHILITE
+	BN_DBLCLK = BN_DOUBLECLICKED
+	BN_SETFOCUS = 6
+	BN_KILLFOCUS = 7
+)
+
+// Button check states.
+const (
+	// from winuser.h
+	BST_UNCHECKED = 0x0000
+	BST_CHECKED = 0x0001
+	BST_INDETERMINATE = 0x0002
+)
+
+var (
+	checkDlgButton = user32.NewProc("CheckDlgButton")
+	checkRadioButton = user32.NewProc("CheckRadioButton")
+	isDlgButtonChecked = user32.NewProc("IsDlgButtonChecked")
+)
+
+func CheckDlgButton(hDlg HWND, nIDButton int, uCheck uint32) (err error) {
+	r1, _, err := checkDlgButton.Call(
+		uintptr(hDlg),
+		uintptr(nIDButton),
+		uintptr(uCheck))
+	if r1 == 0 {		// failure
+		return err
+	}
+	return nil
+}
+
+func CheckRadioButton(hDlg HWND, nIDFirstButton int, nIDLastButton int, nIDCheckButton int) (err error) {
+	r1, _, err := checkRadioButton.Call(
+		uintptr(hDlg),
+		uintptr(nIDFirstButton),
+		uintptr(nIDLastButton),
+		uintptr(nIDCheckButton))
+	if r1 == 0 {		// failure
+		return err
+	}
+	return nil
+}
+
+// TODO handle errors
+func IsDlgButtonChecked(hDlg HWND, nIDButton int) (state uint32, err error) {
+	r1, _, _ := isDlgButtonChecked.Call(
+		uintptr(hDlg),
+		uintptr(nIDButton))
+	return uint32(r1), nil
+}