1 files changed, 1 insertions, 0 deletions
diff --git a/control.go b/control.go
index 16f94bb..1c610b1 100644
--- a/control.go
+++ b/control.go
@@ -9,4 +9,5 @@ import (
 type Control interface {
 	make(window *sysData) error
 	setRect(x int, y int, width int, height int) error
+	preferredSize() (width int, height int, err error)
 }