When passing scope in angular modal controller, it's not showing second time

I am calling modal popup from my controller. It works fine for the first time but doesn't show the second time. Here is the code for the show

$scope.showAdvanced = function (ev) {
    var scopeVar = $scope;
    console.log('$mdDialog');
    console.log($mdDialog);
    $mdDialog.show({
        controller: DialogController,
        templateUrl: 'dialog1.tmpl.html',
        parent: angular.element(document.body),
        scope: $scope,
        targetEvent: ev,
        clickOutsideToClose: true
    }).then(function (result) {

        //$scope = $scope.$parent;
        console.log($scope);
    });

};

Here is my hide function inside DialogController.

   $scope.hide = function () {
    console.log('hide called');
    $mdDialog.hide();
    console.log('hide completed');

};

Hide is executing successfully and followed by callback defined in show which prints the current scope. If I remove scope : $scope and put transclude : true then it is not showing the data in dialog controller though you can show and hide it more than once.

Add preserveScope: true to your modal options. A dialogue removes its scope on closing by default.