header filter does not work well with filterBy

Suite and Optimus Suite 5
#1

I have a grid of document which has type 1 and 0. I have a checkbox that show type 1 document only.

The problem i have is filter attached to the grid header does not take filterBy into account.

For example:
I click the checkbox which run filterBy(TYPE_COLUMN,“1”). Then I filter document name using header filter. The name filter includes document of type 0. I expect to see type 1 document only.

Is there a way to fix that ? I am using v3.0
Sample Code

      var mygrid = new dhtmlXGridObject('documentGrid');
        mygrid.setSkin("light");
        mygrid.attachHeader("#text_filter,#select_filter,#text_filter,&nbsp,&nbsp,&nbsp,&nbsp");        
        mygrid.enableMultiline(true);
        mygrid.init();
 <input type=checkbox name="show_type_1" onclick="show();">Show Type 1 Document
<script>
    function show(){
        if(filter != 1)
        {	
            filter = 1; 	
           Grid.filterBy(3,"1");

        }
        else
        { 
            filte =0;	
            Grid.filterBy(3,"");	
        }
    }
</script>
#2

It’s a normal behavior because filterBy method and header filters have different logic of it’s action.

In that case you may try to add a header select-filter to a column with a checkbox.