How to re-apply previous selections from the API (back, forward  and clear all filters...)

In an integration of mashups and sheets in a external web app via API by initializing the objects, a user might establish a filter with the following way:

aApps[idx].field(clave).selectValues(param[key], true, false);

If in the web page are some action buttons in order to go back, forward  and clear all filters, then when a user pushes the clear all filter button, all the filters, except initial, are cleared, which is perfect. The problem though is when a user is pushing repetedly the back button, the initial filter is cleared at all, and there is no way to go back / not deleting the initial filter.

 eg. Code for clear all button: aApps[idx].clearAll();
Code for back button: aApps[idx].back();