Bug 120544 [build path] Editing external source folder does not persist
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
fClassPathList.setUncheckAllButtonIndex(4);		
			
		fBuildPathDialogField= new StringButtonDialogField(adapter);
		fBuildPathDialogField.setButtonLabel(NewWizardMessages.BuildPathsBlock_buildpath_button); 
		fBuildPathDialogField.setDialogFieldListener(adapter);
		fBuildPathDialogField.setLabelText(NewWizardMessages.BuildPathsBlock_buildpath_label); 
		fBuildPathStatus= new StatusInfo();
		fClassPathStatus= new StatusInfo();
		fOutputFolderStatus= new StatusInfo();
		
		fCurrJProject= null;
	}
	
	
	
	public Control createControl(Composite parent) {
		fSWTWidget= parent;
		
		PixelConverter converter= new PixelConverter(parent);
		
		Composite composite= new Composite(parent, SWT.NONE);	
		composite.setFont(parent.getFont());
		
		GridLayout layout= new GridLayout();
		layout.marginWidth= 0;
		layout.marginHeight= 0;
		layout.numColumns= 1;		
		composite.setLayout(layout);
		
		TabFolder folder= new TabFolder(composite, SWT.NONE);