private void registerAction(String name) {
		DockingToolActions toolActions = plugin.getTool().getToolActions();
		toolActions.registerSharedActionPlaceholder(new DtSharedActionPlaceholder(name));
	}
Displays a data type editor for editing the given Structure. If the structure is already 
being edited then it is brought to the front. Otherwise, a new editor is created and 
displayed.
@param composite the structure.
@param fieldName the optional name of the field to select in the editor.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/editor/DataTypeEditorManager.java