Today i got requirement to hide my custom button, i  just picked it’s id with the help of IE developer toolbar and used easiest line to hide any control

document.getElementById(‘ISV_New_13_ServiceActivity’).style.display=’none’;

and just publised my entity and started testing it but soon after that i started rubbing my head  :-/  as i got JS error, then i test it using alert and found null when tried to get id through document.getElementById.

After some googling i came to know in case of custom button CRM behaves differently, maybe it generate id at run time, so no way to just use simple line to hide button, so i started to searching id of every IL and comparing it with title of my button and it worked

var

ItemList = document.getElementById(“mnuBar1”).rows[0].cells[0].getElementsByTagName(“UL”)[0].getElementsByTagName(“LI”);

for(var i=0; i<ItemList.length-1; i++)

{var str=ItemList[i].id;

if(str.match(‘ServiceActivity’))

{ItemList[i].style.display = “none”;
break;}}

Hope it will help somebody……..