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Combo groups defaults Value

Hi.. my question is next:

I using dhtmlxCombo    Grouping

var z3=new dhtmlXCombo("combo_zone3","alfa3",200);
z3.loadXML("3.php")
z3.setComboText("c2_2");

var z2=new dhtmlXCombo("combo_zone2","alfa2",200);
z2.enableFilteringMode(true);
z2.attachChildCombo(z3,"3.php");
z2.loadXML("2.php");
z2.setComboText("b2_1");

But only show fisrt combo and the second combo too show but hide quickly.. how control thats..??

Tanks...

In your case the first combo has not any value selected ( you have set only text in combo, no any option selected ) , the working code will look as 

var z2=new dhtmlXCombo("combo_zone2","alfa2",200); 
z2.enableFilteringMode(true); 
z2.attachChildCombo(z3,"3.php"); 
z2.loadXML("2.php",function(){
     z2.setComboValue("b2_1");
}); 

Ok, but the second combo don´t show the value... the code is next:

var z3=new dhtmlXCombo("combo_zone3","alfa3",200);
z3.enableFilteringMode(true,function(){
    z3.setComboText("c2_2");})

var z2=new dhtmlXCombo("combo_zone2","alfa2",200); 
z2.enableFilteringMode(true); 
z2.attachChildCombo(z3,"3.php"); 
z2.loadXML("2.php",function(){
     z2.setComboValue("b2_1");
}); 

 

The  combos work fine, first load, and second show values when selected first combo, but default value en the second combo don´t show fine

Yep, the second combo still reloads after value set to "master" combo which caluse value reset, the next code must work correctly

var z3=new dhtmlXCombo("combo_zone3","alfa3",200); 
z3.loadXML("3.php",function(){
  z3.setComboText("c2_2"); 
}) 


var z2=new dhtmlXCombo("combo_zone2","alfa2",200); 
z2.enableFilteringMode(true); 
z2.attachChildCombo(z3,"3.php");
z2.loadXML("2.php",function(){
  z2.setComboText("b2_1");
});