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dhtmlxcombo: tuning usability in filter mode

I have been playing with the dhtmlxcombo widget. Very cool thing ...thanks ... I have two usability improvements I would like to make, but I am not seeing clearly where this can be done:

a) when entering the combobox, the text in the combobox should be selected, so that when I type, it gets replaced by my new entries.

b) When I open the combo with the little arrow, then it should display the full list of entries as long as I have not started modifying the content.

any hints ?

>>a) when entering the combobox, the text in the combobox should be selected
dhtmlxcombo.js, line 931, _toggleSelect

dhtmlXCombo.prototype._toggleSelect = function(e)
{
        var that=this.combo;
        that.DOMelem_input.select();   // this line can be added

>>b) When I open the combo with the little arrow
There is no easy way to achieve such functionality, but still can be done
dhtmlxcombo.js, line 937, _toggleSelect

      (e||event).cancelBubble = true;
      //start of modification
       var t=that.getComboText();
       that.setComboText("")
       that.filterSelf(); //filter as for empty combo
       that.setComboText(t) //restore value
       that.DOMelem_input.select();
      //end of modification
   }