Set NSPopUpButton to track the mouse events untile the mouse is inside the cellFrame and not until mouseUp

NSPopUpButton+Rik.m

@@ -0,0 +1,15 @@
+#import "Rik.h"
+#import <AppKit/NSPopUpButton.h>
+
+@implementation NSPopUpButton (RikTheme)
+
+- (void) mouseDown: (NSEvent*)theEvent
+{ 
+  [_cell trackMouse: theEvent 
+	     inRect: [self bounds] 
+	     ofView: self 
+       untilMouseUp: NO];
+}
+
+@end
+