Congratulations, it looks like you got the hard parts!

On 2009 Oct 08, at 01:23, Zhang Li wrote:

I tried to use [cell setIntValue:NSOnState] before [cell release] to set the checkbox to on state, but failed. Looks like [NSButtonCell SetIntValue] is not the right way to change checkbox state.

NSButtonCell inherits from NSActionCell and NSCell. (See 2nd line of the NSButtonCell documentation). Click the links. Now, try -[NSCell setState:], which will probably work, and -[NSActionCell setObjectValue:], which might work.

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