Bernie,
Since objects are normally wired in the xib, you can try this programmatic construction.
Ken
compile as "Objective-C"
toolbox fn NSApplicationLoad = Boolean
fn NSApplicationLoad()
BeginCCode
NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect( 40, 360, 650, 400 )
styleMask:NSTitledWindowMask backing:NSBackingStoreBuffered defer:YES];
[window setAutorecalculatesKeyViewLoop:TRUE];
NSTextField *fld = [[NSTextField alloc] initWithFrame:NSMakeRect( 20, 357, 300, 23 )];
[[window contentView] addSubview:fld];
[fld release];
NSTabView *tab = [[NSTabView alloc] initWithFrame:NSMakeRect( 12, 12, 576, 340 )];
NSRect tabContentRect = [tab contentRect];
NSTabViewItem *tabItem0 = [[NSTabViewItem alloc] initWithIdentifier:nil];
[tabItem0 setLabel:@"T0"];
NSView *tabItem0View =[[NSView alloc] initWithFrame:tabContentRect];
[tabItem0 setView:tabItem0View];
[tabItem0View release];
[tab addTabViewItem:tabItem0];
[tabItem0 release];
NSTabViewItem *tabItem1 = [[NSTabViewItem alloc] initWithIdentifier:nil];
[tabItem1 setLabel:@"T1"];
NSView *tabItem1View =[[NSView alloc] initWithFrame:tabContentRect];
[tabItem1 setView:tabItem1View];
[tabItem1View release];
[tab addTabViewItem:tabItem1];
[tabItem1 release];
[[window contentView] addSubview:tab];
[tab release];
NSComboBox *box = [[NSComboBox alloc] initWithFrame:NSMakeRect( 20, 220, 200, 23 )];
[tabItem0View addSubview:box];
[box release];
NSComboBox *box2 = [[NSComboBox alloc] initWithFrame:NSMakeRect( 20, 180, 200, 23 )];
[tabItem0View addSubview:box2];
[box2 release];
NSComboBox *box3 = [[NSComboBox alloc] initWithFrame:NSMakeRect( 20, 220, 200, 23 )];
[tabItem1View addSubview:box3];
[box3 release];
NSComboBox *box4 = [[NSComboBox alloc] initWithFrame:NSMakeRect( 20, 180, 200, 23 )];
[tabItem1View addSubview:box4];
[box4 release];
[tab selectTabViewItem:[tab tabViewItemAtIndex:1]];
[tab selectTabViewItem:[tab tabViewItemAtIndex:0]];
[window makeKeyAndOrderFront:nil];
EndC
RunApplicationEventLoop()