Событие OnLoad сущности Account:

function OnCrmPageLoad() {
/* false — collapsed, true — expanded */
//First Tab, Second Section, Expanded
ConvertSection(0,1,true);
//First Tab, First Section, Collapsed
ConvertSection(0,0,false);
}

function ConvertSection( tabIndex , sectionIndex , state ) {
var sec = document.getElementById( «tab» + tabIndex );
var td = sec.childNodes[0].rows[ sectionIndex ].cells[0].childNodes[0].rows[0].cells[0];
var secHTML = td.innerHTML;
state = (typeof(state) == «undefined»)? false:!state;
var src = (state == false)? «/_imgs/tree/dashPlus.gif»:»/_imgs/tree/dashMinus.gif»;
td.innerHTML = «<NOBR style=’VERTICAL-ALIGN: middle;cursor:hand’ onclick=’excoSection(this)’><IMG src=’» + src + «‘ align=’middle’ /> » + td.innerHTML + «</NOBR>»;
td.childNodes[0].childNodes[0].state = state;
excoSection(td.childNodes[0]);
}

/* Toggle SectionState */
function excoSection( sec ) {
sec = sec.childNodes[0];
sec.state = !sec.state;
sec.src = (sec.state)? «/_imgs/tree/dashMinus.gif»:»/_imgs/tree/dashPlus.gif»;
var display = (sec.state)? «inline» :»none»;
var tblsec = sec.parentElement.parentElement.parentElement.parentElement;
for( var i =1 ; i < tblsec.rows.length ; i++ )
tblsec.rows[i].style.display = display;
}
//Expose the toggling function at the window level
this.excoSection = excoSection;

OnCrmPageLoad();

Это весьма гибкое и интересное решение взято отсюда Creating Collapsible Sections.