How to hide a button of split button in the sub grid

Hi Guys,

I want to hide a button in the split button on the sub-grid, but I found I enable a rule to hide a button in the split button, it will hide entire split button, however I use the same way, put a split button in a home page, it can hide one of the split button, I used the same code to test, That's weird. 

Anyone know how to hide one of split button on a sub-grid? 

Thanks,

Stone