OSX App, NSTextField only responds to Force Click - xcode

Question

I am writing my first OS X app and I am running into a problem. I am placing a NSTextField inside of a NSTableViewCell. A single click in the text field does nothing. A force click will, however, activate the textfield to enter text.
Is this because it's embedded in a cell?
So far my code is very simple:
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
NSScrollView * tableContainer = [[NSScrollView alloc] initWithFrame:self.bounds];
mainTableView = [[NSTableView alloc] initWithFrame:NSMakeRect(0, 0, 1200, self.frame.size.height)];
mainTableView.autoresizingMask = NSViewWidthSizable|NSViewHeightSizable;
/// {creating columns here}
[tableContainer addSubview:mainTableView];
mainTableView.backgroundColor = [NSColor whiteColor];
mainTableView.rowHeight = 25;
[mainTableView setDelegate:self];
[mainTableView setDataSource:self];
[tableContainer setDocumentView:mainTableView];
[tableContainer setHasVerticalScroller:YES];
[self addSubview:tableContainer];
[mainTableView reloadData];
}
- (NSView *)tableView:(NSTableView *)tableView
viewForTableColumn:(NSTableColumn *)tableColumn
row:(NSInteger)row {
NSView *view = [[NSView alloc] initWithFrame:CGRectMake(0, 0, tableColumn.width, tableView.rowHeight)];
NSTextField *tf = [[NSTextField alloc] initWithFrame:view.bounds];
tf.stringValue = #"!";
tf.editable = YES;
tf.delegate = self;
[view addSubview:tf];
return view;
}