An element with cmdline: argument name shouldn't be changed

Scenario:

1. Open the Workflow Designer.
2. Create an element with command line tool with name "test"
3. Add string parameter "arg123"
   Expected result: argument name is the same "arg123"
4. Click Next several times until Finish
5. Select "test" element on the scene
6. Call "Edit configuration " from context menu
7. Change "arg123" with "arg12345"
   Expected result: argument name should be the same "arg123"
   Current result: argument name is changed too: "arg12345"