Set using:
<object class="GtkFileChooser*">
<filters>
<filter>filter_id1</filter>
<filter>filter_id2</filter>
</filters>
</object>
Set using:
<object class="GtkFileChooser*">
<filters>
<filter>filter_id1</filter>
<filter>filter_id2</filter>
</filters>
</object>