I try this code, and it is works for me, but the combo only search in the actual page.
Code:
public class AllomasCombo_local extends ComboBox {
    
    String lastQuery;
    
    public AllomasCombo_local() {
    
      
        PagingModelMemoryProxy  proxy = new PagingModelMemoryProxy (AppData.getAllomasok());
         
       
        PagingLoader loader = new BasePagingLoader(proxy);  
        loader.setRemoteSort(true);  
          
         ListStore<AllomasModel> store = new ListStore<AllomasModel>(loader); 
         loader.load(0,50);

        // store.add(AppData.getAllomasok());
        //loader.load();
        

        this.setDisplayField("allomasNev");
        this.setValueField("allomasId");
        this.setPageSize(50);
        this.setStore(store);
        this.setMinChars(1);
        this.setMinListWidth(350);
        this.setAutoWidth(false);
        this.setAllowBlank(false);
        this.setTriggerAction(ComboBox.TriggerAction.ALL);
        //this.setForceSelection(true);
    
        
    }
    
    
    
}
Maybe I need to rewrite the combobox's doQuery method, but I can't becouse of the private variables.

Please, give me any advice!