IBO V4.Ef , D5 Ent

Q1.
I want to know which IB_Control can use into IB_Grid , or i need to
see in source code which involve 'IIB_GridWinControl'. I see IB_Edit
can not use into IB_Grid.

Q2.
In 3.6 , when Some Contols (like IB_EditEnh) get foucs , i can Click
Form Button , but in IBO v4 , i need to click the Button twice time.
First time , cause the Control lose Focus, and second time click
button again.

Q3.
During desing time , whne i put IB_ComboBox into IB_Grid ,
every time i trigger IB_Query Active property True/False.
Error Occur Message
'Cannot Focus a disabled or invisible window.'