Error on Javascript While Trying to Hide Coach button on Opportunity Layout

Hi,

Please check why can't the code below not function well when trying to hide the Coach button on Opportunity Layout.

if (oraclecrmod.getButton.("BTN_TB_OpportunityForm_CoachStage") != undefined)

{

oraclecrmod.getButton("BTN_TB_OpportunityForm_CoachStage").hide();

where "BTN_TB_OpportunityForm_CoachStage" stands for the buttonID of Coach button on Opportunity Layout.

I applied the same approach to other buttons requested to be hidden but I did not encounter any error with them.

Is Coach button always required to be included on the buttons of Opportunity record type?

Please advise your findings.

Thanks.