bootstrap-switch does not fire checkedchanged on asp.net checkbox

I'm using two asp.net ckeckboxes (chk1, and chk2) in a Web Forms project with MasterPage, and I'd like when I click over chk1, the chk2 becomes disable and viceverse without refreshing the entire page, so I'm using updatepanel to achieve this, I just implement the CheckedChanged event on the chk1 and put its AutoPostBack attribute to "true", and everything is ok.

The problem is when I try to implement the bootstrap-switch plugin (the two checkboxes seems like bootstrap-switch perfectly), but the problem is that when I click on the chk1, then the CheckedChanged is not fired, so the enable property of the chk2 is not affected.

I think the problem is when the user clicks on the chk1, in fact the click happens over the span's element's of the bootstrap-switch instead of the chk1 itself.

Please help, sorry for the english.