@Override
    public void render(final Context context, final TickBoxState value, final SafeHtmlBuilder sb) {
        appearance.render(this, context, value, sb);
    }
Construct a new {@link CheckboxCell} that optionally controls selection.

@param dependsOnSelection true if the cell depends on the selection state
@param handlesSelection   true if the cell modifies the selection state
stroom-core-client-widget/src/main/java/stroom/cell/tickbox/client/TickBoxCell.java