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Reference to Grid by its Id

How can I get a reference to a grid knowing only its id?

If you have worked with Dojo, something analogous to dojit.byId();

Cheers

There is no such locator available, constructor of component returns reference to the object, which may be used for all further operation. 
The next code may work ( but not in all cases, based on the way , how grid initialized ) 
     var obj = document.getElementById("gridbox").grid;
     

Thanks for the answer!

I finally iused the reference the constructor gave me, as you suggested.

I want a grid and 4 comboboxes underneath it, whose values are updated each time a row is selected in the grid.

The way I am doing it now (which may NOT be correct), I have to define the 4 combos, and THEN attach the event to the grid, which takes place 30 lines of code later than the actual grid definition. Another problem is that I have to pass 4 arguments (one combo reference for each combo) to the function that is executed when the onRowSelect event occurs, which makes it more confusing.

 It would be convenient to have a get-reference-by-id mechanism, so that events can be defined anywhere, and methods are free of large numbers of object-referencing arguements.

If the procedure I followed is not the best (very likely :-) ) please suggest the correct one.

>>and THEN attach the event to the grid
The event can be attached at any moment ,so it must not cause any problems. 

As far as I can understood, your code may look as 
mygrid = new ....
... some other code ...
var combo1 = new dhtmlXCombo(...
var combo2 = new dhtmlXCombo(...
var combo3 = new dhtmlXCombo(...
var combo4 = new dhtmlXCombo(...

mygrid.attachEvent("onRowSelect",function(id){
   //here , the code which need to be called
   // combo1 - combo4 - can be used as combo objects
   // this - will point to the grid

    combo1.setComboValue(this.cells(id,0).getValue); //for example
})