GraphicalSchema.UsedFileName

Read and write.Type: String.
Contains the full file name, which is used when user saves the graphical schema.
This property is filled up in the following cases:
1. When you fill it up programmatically;
2. When the graphical schema is opened from a file interactively;
3. When you call the Show method and if it contains the file name;
4. When user executes the "Save as..." command.
Thin client, server, thick client.

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