Dia shape sizes

[Ricardo Larrañaga <rrl adinet com uy>]

Hello, my name is Ricardo and i am new using dia. I have a question and 
hope someone out there can help out.
I have created many shapes and a sheet to save them for my diagrams. 
When i created the shapes y was very careful with the size of each 
chape, because they represent real things (connectors), and i wanted to 
be able to create a 1:1 scale diagram. The problem is that when i drag a 
shape created by me from my library sheet into a new diagram, i get the 
shape with another size that isnt the one i created it with. Can someone 
help me find out how can i drag a shape created by me from the sheet and 
get the real size of the shape in the new diagram. Does it have 
something to do with diagram scales?.
Thanks
Ricardo