Close Confirm Dialog But Process Still Running Not Completed

Hi, i have an issue when i Show Confirm dialog in a page but when i selected it's close dialog and page but process still running, it is

not completed. Anybody know this issuse ?

diff: /**SCHEMA_DIFF*/[
			{
				"operation": "merge",
				"name": "Button-be6148b819154a0791eaee8f1635d859",
				"values": {
					"enabled": true,
                    "click": {
                      "bindTo": "confirmRegistrationWriteOffContract"
                    },
				}
			},

methods: {
          confirmRegistrationWriteOffContract: function() {
            var message = this.get("Resources.Strings.RegistrationWriteOffContractRequestMessage");
            Terrasoft.showConfirmation(message, function(result) { 
              if (result === Terrasoft.MessageBoxButtons.YES.returnCode) {
                this.onSaveButtonClick();
              }
            }, ["yes", "no"], this);
          }
        },