C # VS2015 environment, the base class form with a GridControl, when the subclass inherits the form does not appear GridControl run Designer, causing the problem can not be modified, the solution is as follows
1, the parent form GridControl Modifiers properties need to be modified or Protected Public
2, the installation path Dev,
Direct search DXDesignKeys,
Run DXDesignKeys,
Under Visual inheritance options,
勾选Enable visual inheritance for Developer Express controls used in Visual Studio，
Click Apply and Close after,
Restart VS2015 can be solved.
Figure:
