TreeTable setChildrenAllowed to false

Hi !

I use a treeTable component.

When an occurence of the table has no children, I wrote this line code :

table.setChildrenAllowed(myItem, false);

But, I note a space in the first column of the table, and thus all informations are shift right.

When an item has no children, can I delete this space for only this item in the first column ?