NSView showing and hide SubView

In my applications i need to display and hide based upon some user action, i have done following

In interface definition, have added views like that

@interface MyWnd : NSWindowController {

    MyCustomView1 *pCtmView1; 

    MyCustomView2 *pCtmView2;
}

In source file have following relevant methods

-(void)CreateSubViews{

    NSRect subViewRect = [self GetSubViewRect];

    pCtmView1 = [[ MyCustomView1 alloc]initWithFrame:subViewRect]

    pCtmView2 = [[ MyCustomView2 alloc]initWithFrame:subViewRect]

    initially both view will be hidden 

    [pCtmView1 setHidden:TRUE];
    [pCtmView2 setHidden:TRUE];

    [[self window] view addSubView:pCtmView1];
    [[self window] view addSubView:pCtmView2];
}

-(void)ShowSubView:(int)viewId{
  if(viewId == 0 ){
    [pCtmView1 setHidden:FALSE];
    [pCtmView1 setNeedDisplay:YES];
 }
 if(viewId == 1 ){
    [pCtmView2 setHidden:FALSE];
    [pCtmView2 setNeedDisplay:YES];
 }
}

In Init Appli开发者_Python百科cation i am Calling ShowSubView:0 and its working fine, but depend upon the some user action, i will call ShowSubView:1 and nothing is displayed & EXEC_BAD_ACCESS i could see in the gdb

Please guide me, do i need to do something more to display the view

Thanks

---

When your app crashes, look in the Debugger window—it'll tell you what your app was doing when it crashed.

You'll probably want to stop the debugger and re-run your app under Instruments's Zombies instrument. When the crash is because you messaged a dead object (which is the cause probably 80% of the time in Cocoa), the Zombies instrument will tell you what object that was and what killed it.