SuggestBox not showing Suggestion

I have a view with a TextBox, In my presenter I populate the suggestion list with an RPC call and wrap TextBox in a SuggestionBox. The Suggestion box is not showing any suggestion.

Code goes like-->

citysuggest=new SuggestBox(cityoracle,display.getCityBox());    //wrapping in textbox+passing MultiWordSuggestOracle refrence

((Display) display.asWidget()).getVerticalPanel().insert(citysuggest,1);  //Inserting the SuggestBox in view

System.err.println(citysuggest.isSuggestionListShowing());   // This shows false 

What could be the issue? I have many widgets in my view. There seems no space unless the suggestionlist pops over other Labels and SuggestionBoxes. Can that be an issue? Whats the way out?

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