Not able to change sequence number of a button in the FPM toolbar

Hi Experts,

I want to add a custom button in one existing custom FPM application. It already has some std buttons as well as custom buttons. I want to add the a new button in the last position in the toolbar.

I am adding toolbar element of type 'Other Function' and to put it in the last position I am changing the sequence number attribute. But system is automatically changing the sequence number to 1. I am not understanding why it is happening.  I am just making sequence number = last button's seq no  + 1.

Please help me.

Regards,

Sameer