AbstractTable table = getTable((BaseColumn) component);

        if (table == null) {

            throw new IllegalStateException("SelectionColumn must be nested inside a DataTable/TreeTable component");

        }

        if (selection == null) {

            throw new IllegalStateException("<o:selectionColumn> must be inserted into a DataTable/TreeTable with selection enabled. table id: " + table.getClientId(context));

        }

        boolean rowSelection = true; // selection instanceof RowSelection

        /*if (!rowSelection)

            throw new IllegalStateException("<o:selectionColumn> can only be inserted into a DataTable/TreeTable with row selection. table id: " + table.getClientId(context));

        */

        ResponseWriter writer = context.getResponseWriter();

                if (table == null)

                    throw new FacesException("<o:selectRowCheckbox> can only be used in columns of table components " +

                            "(<o:dataTable> or <o:treeTable)");

                if (selection == null)

                    throw new IllegalStateException("<o:selectRowCheckbox> can only be used in a DataTable or " +

                            "TreeTable with multiple selection. clientId = " + selectRowCheckbox.getClientId(context));

                if (!multipleRowSelection)

                    throw new IllegalStateException("<o:selectRowCheckbox> can only be inserted into a DataTable or " +

                            "TreeTable with multiple selection, but single selection is used here. clientId = " + selectRowCheckbox.getClientId(context));

                selectRowCheckbox.setTriStateAllowed(table instanceof TreeTable);

        if (table == null)

            throw new IllegalStateException("SelectionColumn must be nested inside a table");

        BaseColumn col = getColumn(component);

        boolean checkBoxColHeader = col instanceof CheckboxColumn;

        if (!checkBoxColHeader) {

            selection = table.getSelection();

            if (selection == null)

                throw new IllegalStateException("<o:selectAllCheckbox> can only be inserted into a DataTable or TreeTable with multiple selection. clientId = " + component.getClientId(context));

            if (!multipleRowSelection)

                throw new IllegalStateException("<o:selectAllCheckbox> can only be inserted into a DataTable or TreeTable with multiple selection. clientId = " + component.getClientId(context));

        } else

            selection = null;

        SelectAllCheckbox selectAllCheckbox = (SelectAllCheckbox) component;

        if (!checkBoxColHeader) {

                selectAllCheckbox.setDisabled(true);

            }

        }

        selectAllCheckbox.setSelected(false);