diff --git a/Quicksilver/Code-QuickStepInterface/QSCommandBuilder.m b/Quicksilver/Code-QuickStepInterface/QSCommandBuilder.m
index 811808716..184fa06a3 100644
--- a/Quicksilver/Code-QuickStepInterface/QSCommandBuilder.m
+++ b/Quicksilver/Code-QuickStepInterface/QSCommandBuilder.m
@@ -10,15 +10,15 @@ - (id)init {
 }
 - (void)windowDidLoad {
 	[super windowDidLoad];
-	[dSelector setDropMode:QSSelectDropMode];
-	[aSelector setDropMode:QSRejectDropMode];
-	[iSelector setDropMode:QSSelectDropMode];
 	NSArray *theControls = [NSArray arrayWithObjects:dSelector, aSelector, iSelector, nil];
 	for(QSSearchObjectView *theControl in theControls) {
+		[theControl setDropMode:QSSelectDropMode];
 		QSObjectCell *theCell = [theControl cell];
 		[theCell setHighlightColor:[NSColor lightGrayColor]];
 		[theCell setTextColor:[NSColor blackColor]];
 	}
+	// don't observe notifications meant for the main interface
+	[self ignoreInterfaceNotifications];
 }
 
 - (IBAction)hideWindows:(id)sender {
diff --git a/Quicksilver/Code-QuickStepInterface/QSInterfaceController.h b/Quicksilver/Code-QuickStepInterface/QSInterfaceController.h
index 55d8c8efd..1419f0b2d 100644
--- a/Quicksilver/Code-QuickStepInterface/QSInterfaceController.h
+++ b/Quicksilver/Code-QuickStepInterface/QSInterfaceController.h
@@ -95,4 +95,5 @@
 - (void)setPreview:(BOOL)flag;
 
 - (void)clearObjectView:(QSSearchObjectView *)view;
+- (void)ignoreInterfaceNotifications;
 @end
diff --git a/Quicksilver/Code-QuickStepInterface/QSInterfaceController.m b/Quicksilver/Code-QuickStepInterface/QSInterfaceController.m
index fd7e23d64..c24692920 100644
--- a/Quicksilver/Code-QuickStepInterface/QSInterfaceController.m
+++ b/Quicksilver/Code-QuickStepInterface/QSInterfaceController.m
@@ -468,6 +468,14 @@ - (void)clear:(NSTimer *)timer {
 	[self updateActionsNow];
 }
 
+- (void)ignoreInterfaceNotifications
+{
+	// subclasses (namely the Command Builder) need a way to overlook notifications meant for the main interface
+	NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
+	[nc removeObserver:self name:@"QSSourceArrayCreated" object:nil];
+	[nc removeObserver:self name:@"QSSourceArrayUpdated" object:nil];
+}
+
 #pragma mark -
 #pragma mark NSWindow
 #pragma mark Delegate