Custom Tab invisible after modification

Created custom tabs are not visible after did a modification to the mater form. To solve this is it requiems to re create all tabs again? this is happen only  in Customer Order

Ex: 

1. Created a custom tab on Customer Order (frmCustomerOrder).
2. Did a  modification on Customer Order.
3. Custom tab not visible (since not opening the cust file - frmCustomerOrder_Cust
4. can we resolve this without creating custom tabs again on frmCustomerOrder_Cust?

Hi @USLA 

Follow below steps after that custom tab visible on your window.

Step1: Go to customer order window. 

Step2: RMB → custom Objects → then click on Reload the Configuration.

Step3: RMB goto to properties click on layout tab after that click on custom tab and set position on window.

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