Adding listener to Ext.grid.ColumnModel

[Milkgampmal]

i was trying to add a listener(columnshow) to Ext.grid.ColumnModel inside a Ext.grid.GridPanel, but my listener function is not being called.pls help.parts of code pasted below.\[code\] var gridCm = new Ext.grid.ColumnModel({ columns : data.result.columns, listeners : { columnshow : function( a , b ) { alert(1); } } });\[/code\]