I have a custom priviledge,where InventOnhand form is available in Inquiry,There is a button Dimension Display,but check boxes are not editable

Hi Friends,

I am using ax 2012 R3,I have custom privilege,where On Hand Form is visible

In Inventory Management->Inquiries->On-hand.

But On ,On -Hand  Form,Dimension Display Form,check boxes are not editable,

I have added display menu Item InventDimParmFixed,with delete Rights...

Any thing else I have to do????