About item click event an error problem.

[HotBitmapGG]

When adding the Header, and then set the Item click event will appear by clicking on the Header is an error to collapse, only add the if (position < 0) return;To solve it, don't know whether the authors can modify this problem,thanks.

[orhanobut]

I'm not sure If I understand it correctly. Can you elaborate it? A code snippet would be great.