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Add a button in Insert Variable dialog, which can hunt worksheet cell and then insert it:

1. The substitution text will be in the form of (n, @WT, col, row).
2. It supports both label area and data area.
   
   
   
3. Also support selecting data range.
    

In the Insert Variable Dialog, if the root node on the right panel is selected, we are now able to insert: 

1. Active Window Name //%H
2. Project Path //%X, only show when the project was saved once
3. Project Name //%G, only show when the project was saved once

into the graph or worksheet.

he dialog show a root node on right panel called Graph#-Layer#.
We can show these 3 nodes in info tab of Graph#-Layer#