fix ToBindingList issue

[SvetlanaPN]

No description provided.

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

[BUILDING ERROR]
   OUTPUT: Form1.Designer.cs(133,42): error CS0234: The type or namespace name 'SchedulerDataStorage' does not exist in the namespace 'DevExpress.XtraScheduler' (are you missing an assembly reference?) [R:\Temp\b7f154cc-757b-479b-8265-4265ff414db5\tempTestingCS\XtraSchedulerEFTest\XtraSchedulerEFTest.csproj]

http://codecentral:8080/job/entity-framework-codefirst-model-for-xtrascheduler-data-binding-e4107_15.2.4+/21/console

[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

[BUILDING ERROR]
   OUTPUT: Form1.Designer.cs(133,42): error CS0234: The type or namespace name 'SchedulerDataStorage' does not exist in the namespace 'DevExpress.XtraScheduler' (are you missing an assembly reference?) [R:\Temp\628fb64b-aaa2-49a2-b148-769be790c947\tempTestingCS\XtraSchedulerEFTest\XtraSchedulerEFTest.csproj]

http://codecentral:8080/job/entity-framework-codefirst-model-for-xtrascheduler-data-binding-e4107_15.2.4+/22/console