iphone - presentModalViewController not responding -

i have 3 classes.

first controllor first controllor in tabbar. using presentmodalviewcontroller present login screen , home screen. have presentmodalviewcontroller in firstcontrollor present login screen , in loginscreen viewdidload method have presentmodalviewcontroller present home screen. home screen presentmodalviewcontroller dismissed in homepage_btn_clicked , presentmodalviewcontroller dismissed in login_btn_clicked. problem have home screen never presented. help? new in iphone development.

//first controllor 

firstcontrollor.m

- (void)viewdidload {     [super viewdidload];      accounts_login *lvc = [[accounts_login alloc]initwithnibname:@"accounts_login" bundle:[nsbundle mainbundle]];     [self presentmodalviewcontroller:lvc animated:no];         [lvc release];  }  //login_view class 

login_view.m

- (void)viewdidload {      [super viewdidload];      home_screen *lvc1 = [[home_screen alloc]initwithnibname:@"home_screen" bundle:[nsbundle mainbundle]];     [self presentmodalviewcontroller:lvc1 animated:no];         [lvc1 release];      user_id_textfield.text = [[nsuserdefaults standarduserdefaults] objectforkey:@"user id"];  }  -(ibaction) login_btn_clicked{      if ([services authenticate:credential_data]) {          [self dismissmodalviewcontrolleranimated:yes];      [credential_data autorelease]; }  //homepage class 

homepage.m

    -(ibaction) homepage_btn_clicked:(id) sender{      uibutton *thebutton = (uibutton *)sender;      int count;      switch (thebutton.tag) {          case 101:             count++;             [self dismissmodalviewcontrolleranimated:yes];             break;         default:             break;     }  } 

try this:

home_screen *lvc1 = [[home_screen alloc]initwithnibname:@"home_screen" bundle:[nsbundle mainbundle]]; [self.parentviewcontroller presentmodalviewcontroller:lvc1 animated:no];     [lvc1 release];