Is it possible to set two cells collapse by default at a time in 5.1.0 version - urgent

newlay.layout = new dhtmlXLayoutObject({
parent: document.body, // id/object, parent container for layout
pattern: “4T”, // string, layout’s pattern
offsets: { // optional
top: 10,
right: 10,
bottom: 10,
left: 10
},
cells: [
{
id: “a”, // id of the cell you want to configure
header: true, // hide header on init
text: headerText, // header text
collapsed_text: headerText, // header text for a collapsed cell
height: 147, // cell init height
fix_size: [false, true] // fix cell’s size, [width,height]
},
{
id: “b”, // id of the cell you want to configure
text: “Select/Edit Controls”, // header text
collapsed_text: “Select/Edit Controls”, // header text for a collapsed cell
header: false, // hide header on init
fix_size: [false, false] // fix cell’s size, [width,height]
},
{
id: “c”, // id of the cell you want to configure
text: “View/Edit Details”, // header text
collapsed_text: “View/Edit Details”, // header text for a collapsed cell
width: 1050,
collapse: true,
header: true, // hide header on init
fix_size: [false, false] // fix cell’s size, [width,height]
},
{
id: “d”, // id of the cell you want to configure
text: “Information”, // header text
collapsed_text: “Information”, // header text for a collapsed cell
width: 1050,
collapse: true,
header: true, // hide header on init
fix_size: [true, false] // fix cell’s size, [width,height]
}
]
});

i need to collapse c and d cell by default.but it is not working.Please help me on this.how to acheive two cell collapse at a time?

I aplogize for the delay.
Unfortunaetly the structure of the dhtmlxLayout does not allow to collapse the c and d cells of the 4T layout.