Bug 178297 [Dialogs] - remove required field color
There are still some dialogs using the (now deprecated) class FieldAssistColors. We shouldn't color the required fields anymore in these dialogs: NewFolderDialog CreateLinkedResourceGroup ResourceWorkingSetPage ContainerSelectionGroup ResourceAndContainerGroup
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/misc/ResourceAndContainerGroup.java
IWorkspace workspace = ResourcesPlugin.getWorkspace();
        String projectName = path.segment(0);
        if (projectName == null
                || !workspace.getRoot().getProject(projectName).exists()) {
            problemType = PROBLEM_PROJECT_DOES_NOT_EXIST;
            problemMessage = IDEWorkbenchMessages.ResourceGroup_noProject;
            return false;
        }
        
        IWorkspaceRoot root = workspace.getRoot();
        while (path.segmentCount() > 1) {
        	if (root.getFile(path).exists()) {
        		problemType = PROBLEM_PATH_OCCUPIED;
        		problemMessage = NLS.bind(IDEWorkbenchMessages.ResourceGroup_pathOccupied, path.makeRelative());
        		return false;
        	}
        	path = path.removeLastSegments(1);
        }
        return true;
    }
    /**
     * Validates the values for each of the group's controls.  If an invalid
     * value is found then a descriptive error message is stored for later
     * reference.  Returns a boolean indicating the validity of all of the
     * controls in the group.
     */
    protected boolean validateControls() {
        
        if (containerGroup == null) {
            return false;