diff --git a/Sources/VLSheetView.mm b/Sources/VLSheetView.mm
index 465d492..8be5b33 100644
--- a/Sources/VLSheetView.mm
+++ b/Sources/VLSheetView.mm
@@ -850,7 +850,7 @@ const float kSemiFloor = -1.0f*kLineH;
 		[self editLyrics];
 		break;
 	case kRegionMeasure:
-		[self editSelection];
+        [self editSelection:([event modifierFlags] & NSShiftKeyMask) != 0];
 		break;
 	default:
 		break;
diff --git a/Sources/VLSheetViewSelection.h b/Sources/VLSheetViewSelection.h
index d606202..61be7ba 100644
--- a/Sources/VLSheetViewSelection.h
+++ b/Sources/VLSheetViewSelection.h
@@ -5,14 +5,14 @@
 //
 //      (MN)    Matthias Neeracher
 //
-// Copyright © 2006-2007 Matthias Neeracher
+// Copyright © 2006-2011 Matthias Neeracher
 //
 
 #import "VLMIDIWriter.h"
 
 @interface VLSheetView (Selection)
 
-- (void)editSelection;
+- (void)editSelection:(BOOL)extend;
 - (void)adjustSelection:(NSEvent *)event;
 - (NSRange)sectionsInSelection;
 
diff --git a/Sources/VLSheetViewSelection.mm b/Sources/VLSheetViewSelection.mm
index 943a1fe..0443e33 100644
--- a/Sources/VLSheetViewSelection.mm
+++ b/Sources/VLSheetViewSelection.mm
@@ -5,7 +5,7 @@
 //
 //      (MN)    Matthias Neeracher
 //
-// Copyright © 2006-2007 Matthias Neeracher
+// Copyright © 2006-2011 Matthias Neeracher
 //
 
 #import "VLSheetView.h"
@@ -109,9 +109,16 @@ VLSequenceCallback(
 
 @implementation VLSheetView (Selection)
 
-- (void)editSelection
+- (void)editSelection:(BOOL)extend
 {
-	fSelStart	= fSelEnd	= fSelAnchor = fCursorMeasure;
+    if (extend && fSelStart > -1) {
+        if (fCursorMeasure > fSelEnd)
+            fSelEnd = fCursorMeasure;
+        else if (fCursorMeasure < fSelStart)
+            fSelStart = fCursorMeasure;
+    } else {
+        fSelStart	= fSelEnd	= fSelAnchor = fCursorMeasure;
+    }
 	[self updateMenus];
 	[self setNeedsDisplay:YES];	
 }