You can't change the dialog, you will have to build your own from scratch.
Production: NX10.0.3, VERICUT 8.1, FBM, MRL 3.1.4 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 10.1
Development: VB.NET, Tcl/Tk Testing: NX12.0 Preparing: NX12.0
Employees of the customers, together we are strong
How to Get the Most from Your Signature in the Community