it works

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@169 b9cfdab3-6d41-4d17-bbe4-086880011989

include/Mw/Widget/ScrollBar.h

@@ -18,6 +18,13 @@ extern "C" {
  */
 MWDECL MwClass MwScrollBarClass;
 
+/*!
+ * %brief Calculates a visible length of scrollbar
+ * %param handle Widget
+ * %return Visible length
+ */
+MWDECL int MwScrollBarGetVisibleLength(MwWidget handle);
+
 #ifdef __cplusplus
 }
 #endif