diff --git a/include/Mw/Core.h b/include/Mw/Core.h
index 00d0007..b5e4095 100644
--- a/include/Mw/Core.h
+++ b/include/Mw/Core.h
@@ -37,6 +37,8 @@ MWDECL void MwDispatchUserHandler(MwWidget handle, const char* key, void* handle
 MWDECL void MwSetErrorHandler(MwErrorHandler handler, void* user_data);
 MWDECL void MwDispatchError(int code, const char* message);
 
+MWDECL jmp_buf MwGetBeforeStep(MwWidget handle);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/Mw/MachDep.h b/include/Mw/MachDep.h
index 5b05ddf..d9004a2 100644
--- a/include/Mw/MachDep.h
+++ b/include/Mw/MachDep.h
@@ -6,6 +6,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <setjmp.h>
 #ifdef _WIN32
 #include <windows.h>
 #else
diff --git a/include/Mw/TypeDefs.h b/include/Mw/TypeDefs.h
index 93829c8..9d231a1 100644
--- a/include/Mw/TypeDefs.h
+++ b/include/Mw/TypeDefs.h
@@ -61,8 +61,9 @@ struct _MwWidget {
 	MwWidget* children;
 	MwClass	  widget_class;
 
-	int pressed;
-	int close;
+	int	pressed;
+	int	close;
+	jmp_buf before_step;
 
 	void* internal;
 
diff --git a/src/core.c b/src/core.c
index a6a1281..7287619 100644
--- a/src/core.c
+++ b/src/core.c
@@ -142,6 +142,8 @@ int MwPending(MwWidget handle) {
 
 void MwLoop(MwWidget handle) {
 	while(!handle->close) {
+		setjmp(handle->before_step);
+
 		MwStep(handle);
 
 		MwDispatchUserHandler(handle, MwNtickHandler, NULL);
@@ -273,3 +275,7 @@ void MwDispatchError(int code, const char* message) {
 		exit(1);
 	}
 }
+
+jmp_buf MwGetBeforeStep(MwWidget handle) {
+	return handle->before_step;
+}