forms - Setting values for multi select elements in magento custom module -


I am developing a custom module in Magnomen and having difficulty defining options for multi-select elemets 

  $ this-> _addFieldsToFieldset ($ fieldset, array ('cities' = & gt; array ('label' = & gt; $ this- & gt; __ ('city'), 'input' = & gt; 'multiselect', 'required' = & Gt; true, 'option' => $ zone solver-> getAvailableCities (),),)); Like   
 ... and getAvailableCities (),  
  $ read = Dana :: getSingleton ('core / resources') - & gt; GetConnection ('core_read'); $ Result = $ read-> Receive (choose from all "districts"); $ Option = array (); Forex currency ($ result as $ line) {$ option [$ row ['city_id']] = $ line ['city']; } Return the $ option; }   
 But multi-selection element is shown but there is no population in the form. But if I wanted to set it as a general select element then it would be populated.   
 
 
 For anyone else on the same issue  
 $$ - & gt; _addFieldsToFieldset ($ fieldset, array ( 
  'cities' = & gt; array ('label' = & gt; $ this- & gt; __ ('city'), 'input' = & Gt; Multipurpose ',' expected '=> true,' value '= & gt; $ zone error-> getAvailableCities (),),));   
 The above options should change the values ​​and the values ​​array should be in the following format  
  $ options [==] ('value' = & gt ; $ Line ['city_id'], 'label' = & gt; $ line ['city']);

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