Now I got other way to get the solution.
I used 'CuteEditor_OnInitialized' function which give me object of editor and things work without call of alert function.
Still I am not convinced with this solution where i compel myself to use 'CuteEditor_OnInitialized' method. :(
one thing i would like to know ...who is calling this method ? and shall i override the parameters passed to this function?