[flexcoders] ContextMenu in DataGrid

[yonghan79]

Hi all,i've managed to populate items in DataGrid by using amfphp and 
arraycollection..I'm intending to use ContextMenu,i follow the examples from 
blog.flexexamples.com..It shows warning : Data Binding will not be able to 
detect assigment to "cm". Suppose something wrong there?Please point me..Thanks 
a lot..