Create Custom visuals - Set bar color

Hello All,

I am developing custome visual for Stack bar chart and I am facing issue while implementing color palette, 

I have added color palette successfully but not able to save its value and retrive it in bar. 

Once we select color from palette it will again set as default.

Below is my code snipet from custom visual.

let colorPalette: IColorPalette = hst.colorPalette;
            if (this.ColumnValues.length > 0 ) 
            {
                for(var i=0; i < this.ColumnValues.length; i++) 
                {
                    let defaultColor: Fill = {
                        solid: {
                            color: colorPalette.getColor(this.ColumnValues[i] + '').value
                        }
                    };
                    var objn  = { FieldName: this.ColumnValues[i] };
                    objn["Color"] = Visual.getCategoricalObjectValue<Fill>(this.ColumnValues[i], i, 'colorSelector', 'fill', defaultColor).solid.color,
                    objn["LegendLabel"] = this.ColumnValues[i];
                    objn["selectionId"] = Visual.getSelectionIds(element.dataViews[0],hst)
                    this.stackOriginalFields.push(objn);
                }
            }
			*ColumnValues = Two Different Value of Catehory
			public enumerateObjectInstances(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstanceEnumeration {
            let objectName = options.objectName;
            let objectEnumeration: VisualObjectInstance[] = [];                
            var c = this.stackOriginalFields;
			 switch(objectName) {
			 case 'colorSelector':
                    for (let barDataPoint of c) {
                        objectEnumeration.push({
                            objectName: objectName,
                            displayName: barDataPoint.LegendLabel ,
                            properties: {
                                fill: {
                                    solid: {
                                        Color: barDataPoint.Color
                                    }
                                }
                            },
                            //selector: barDataPoint.LegendLabel
							//selector:barDataPoint.selectionId.getSelector() //Its not working						
                            selector:barDataPoint.selectionId
                        });
                    }
                    break;
			 };        
            return objectEnumeration;
			}
			public static getCategoricalObjectValue<T>(category: DataViewCategoryColumn, index: number, objectName: string, propertyName: string, defaultValue: T): T {
            let categoryObjects = category.objects;
            if (categoryObjects) {
                let categoryObject: DataViewObject = categoryObjects[index];
                if (categoryObject) {                    
                    let object = categoryObject[objectName];
                    if (object) {
                        console.log("object"+object)
                        let property: T = <T>object[propertyName];
                        if (property !== undefined) {
                            return property;
                        }
                    }
                }
            }
            return defaultValue;
        }

        private static getSelectionIds(
            dataView: DataView,
            host: IVisualHost
        ): powerbi.visuals.ISelectionId[] {
            const queryName: string = dataView.table.columns[0].queryName;

            return dataView.table.identity.map((identity: DataViewScopeIdentity) => {
                const categoryColumn: DataViewCategoryColumn = {
                    source: {
                        queryName,
                        displayName: null
                    },
                    values: null,
                    identity: [identity]
                };

                return host.createSelectionIdBuilder()
                    .withCategory(categoryColumn, 0)
                    .withMeasure(queryName)
                    .createSelectionId();
            });
        }
			
			
	*In Capabilities.json file
	dataViewMappings": [
      {
        "table": {
          "rows": {
            "select": [
              { "for": { "in": "Columnvalues" }}
            ]
          }
        }
      }
    ]

Thanks In Advance