Index: uspace/app/calculator/calculator.c
===================================================================
--- uspace/app/calculator/calculator.c	(revision 552b69f240ec8edc47b2b988d0b23e54621bbde0)
+++ uspace/app/calculator/calculator.c	(revision 7fc81da1fa798e3f7a52bc8d00553155f47140d4)
@@ -186,4 +186,7 @@
 	calc_t *calc = (calc_t *) arg;
 
+	if (ui_window_def_kbd(window, event) == ui_claimed)
+		return;
+
 	if (event->type == KEY_PRESS && (event->mods & KM_CTRL) != 0) {
 		switch (event->key) {