Remove Binding Context - SAPUI5

Hello All,

I set a binding context to a viz-column-graph when I click on a datapoint. But now I want to implement a method where, on a button click(on UI) I need to remove the current context thats been binded to the graph.

My current code to do that:

onPress:function(){
flattened_dataset = this.getView().byId("dataset");
dataset.removeAllDimensions();
new_dimesion_prd_name = new sap.viz.ui5.data.DimensionDefinition ({name:"Product_Name", axis:1, value:"{Product_Name}"});
new_dimesion_year = new sap.viz.ui5.data.DimensionDefinition ({name:"Year", axis:1, value:"{Year}"});
new_dimesion_quarter = new sap.viz.ui5.data.DimensionDefinition ({name:"Quarter", axis:1, value:"{Quarter}"});
dataset.insertDimension(new_dimesion_prd_name,1);
dataset.insertDimension(new_dimesion_year,2);
dataset.insertDimension(new_dimesion_quarter,3);
var graph = this.getView().byId("graph");
graph.unbindElement();
flattened_dataset.bindData('Quarter');

But the unbindElement() does not work in my case. Maybe I am missing something.

Any suggestions on How to remove the current binding context on  a page or graph element etc.

Thanks in advance.

Regards

Sangamesh