Can i overide displayMsg from pagingtoolbar ? If yes , how ?

I want to use displayMsg to show more information about my table so , i want to add more things like :

'Displaying {0} - {1} of {2} - {3} '

For 3 i want add my own function something like :

getSelectedItems: function () { var me = this;

var selItems = me.dyn.view.getSelectionModel().getSelection();

var selItemsLength = selItems.length;

var selItemsIds = [];

var i = 0;

if (selItemsLength) {

for (i = 0; i < selItemsLength; i++) {

selItemsIds.push(selItems[i].internalId);

}

}

return selItemsIds;

}

and return selItemsIds.length + some messege

Can i overide displayMsg from pagingtoolbar ? If yes , how ?