1 files changed, 3 insertions, 0 deletions
diff --git a/sysdata.go b/sysdata.go
index 1d4ecbd..41319b1 100644
--- a/sysdata.go
+++ b/sysdata.go
@@ -12,6 +12,9 @@ type cSysData struct {
 
 	// for Window
 	closing	chan struct{}
+
+	// for Button
+	clicked	chan struct{}
 }
 func (c *cSysData) make(initText string, initWidth int, initHeight int) error {
 	panic(runtime.GOOS + " sysData does not define make()")