--- /dev/null
+<USE "VS100">
+<INCLUDE "VSUDEFS" "VSUTYPES">
+
+<DEFINE F ("OPT" (CHN .CH) "AUX" EV)
+ <REPEAT ()
+ <COND (<AND <TYPE? <SET EV <CHANNEL-OP .CHN READ-BYTE-IMMEDIATE>>
+ MOUSE-EVENT>
+ <==? <ME-KIND .EV> ,ME-LEFT-PRESSED>>
+ <RETURN <CHANNEL-OP .CHN MOUSE-RESIZE-WINDOW ,MOUSE-LEFT>>)>>>