async handleConfirm(oEvent) {
			const oCustomFilter = this.byId("categoryFilterDialog").getFilterItems()[1];
			const oSlider = oCustomFilter.getCustomControl().getAggregation("content")[0];
			this._iLowFilterPreviousValue = oSlider.getValue();
			this._iHighFilterPreviousValue = oSlider.getValue2();
			await this._applyFilter(oEvent);
		}
Updates the previous slider values
@param {sap.ui.base.Event} oEvent the press event of the sap.m.Button