Can not change properties at design-time from controls in an inherited Form

[me_code2004]

Hi guys,

I have a Form that inherited from another Form, the base Form have a DataGridView and BindingNavigator, all the modifier for the Controls in the base Form is Protected, but the problem is at design time all the Properties for the DataGridView and BindingNavigator from the base Form can not be changed directly from the child Form, any common Controls doesn't have the problem like the two. My question is why the both Controls can not be changed directly from the child Form? Beside the DataGridView and BindingNavigator, is there any Controls that behaves like the two?

Thanks in advance.